diff --git a/Gemfile b/Gemfile
index 01bd5af1..e9ad0901 100644
--- a/Gemfile
+++ b/Gemfile
@@ -183,6 +183,9 @@ gem 'faker'
 # for seeds
 gem 'factory_girl_rails'
 
+# for online payments
+gem 'activemerchant'
+
 # Use guard and spring for testing in development
 group :development do
   # to launch specs when files are modified
diff --git a/Gemfile.lock b/Gemfile.lock
index 4647f23c..43245d31 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,6 +26,11 @@ GEM
     activejob (4.2.5.2)
       activesupport (= 4.2.5.2)
       globalid (>= 0.3.0)
+    activemerchant (1.59.0)
+      activesupport (>= 3.2.14, < 5.1)
+      builder (>= 2.1.2, < 4.0.0)
+      i18n (>= 0.6.9)
+      nokogiri (~> 1.4)
     activemodel (4.2.5.2)
       activesupport (= 4.2.5.2)
       builder (~> 3.1)
@@ -529,6 +534,7 @@ PLATFORMS
 
 DEPENDENCIES
   active_model_serializers
+  activemerchant
   activeuuid
   acts_as_commentable_with_threading
   acts_as_list
diff --git a/app/assets/images/credit_card.png b/app/assets/images/credit_card.png
new file mode 100644
index 00000000..a5e0b1e3
Binary files /dev/null and b/app/assets/images/credit_card.png differ
diff --git a/app/controllers/conference_registrations_controller.rb b/app/controllers/conference_registrations_controller.rb
index 95e5c447..176f7937 100644
--- a/app/controllers/conference_registrations_controller.rb
+++ b/app/controllers/conference_registrations_controller.rb
@@ -28,8 +28,10 @@ class ConferenceRegistrationsController < ApplicationController
   end
 
   def show
-    @total_price = Ticket.total_price(@conference, current_user)
-    @tickets = current_user.ticket_purchases.where(conference_id: @conference.id)
+    @total_price = Ticket.total_price(@conference, current_user, paid: true)
+    @tickets = current_user.ticket_purchases.by_conference(@conference).paid
+    @ticket_payments = @tickets.group_by(&:ticket_id)
+    @total_quantity = @tickets.group(:ticket_id).sum(:quantity)
   end
 
   def edit; end
diff --git a/app/controllers/payments_controller.rb b/app/controllers/payments_controller.rb
new file mode 100644
index 00000000..077969f1
--- /dev/null
+++ b/app/controllers/payments_controller.rb
@@ -0,0 +1,38 @@
+class PaymentsController < ApplicationController
+  before_action :authenticate_user!
+  load_and_authorize_resource
+  load_resource :conference, find_by: :short_title
+  authorize_resource :conference_registrations, class: Registration
+
+  def index
+    @payments = current_user.payments
+  end
+
+  def new
+    @total_amount_to_pay = Ticket.total_price(@conference, current_user, paid: false)
+  end
+
+  def create
+    @payment = Payment.new(payment_params)
+
+    if @payment.purchase && @payment.save
+      update_purchased_ticket_purchases
+      redirect_to conference_conference_registration_path(@conference.short_title), flash: { success: 'Thanks! You have purchased your tickets successfully.' }
+    else
+      @total_amount_to_pay = Ticket.total_price(@conference, current_user, paid: false)
+      render 'new'
+    end
+  end
+
+  private
+
+  def update_purchased_ticket_purchases
+    current_user.ticket_purchases.by_conference(@conference).unpaid.update_all(paid: true, payment_id: @payment.id)
+  end
+
+  def payment_params
+    params.require(:payment)
+      .permit(:full_name, :credit_card_number, :expiration_month, :expiration_year, :card_verification_value, :amount)
+      .merge(user: current_user, conference: @conference)
+  end
+end
diff --git a/app/controllers/ticket_purchases_controller.rb b/app/controllers/ticket_purchases_controller.rb
index 30d24d82..ff52021a 100644
--- a/app/controllers/ticket_purchases_controller.rb
+++ b/app/controllers/ticket_purchases_controller.rb
@@ -4,11 +4,11 @@ class TicketPurchasesController < ApplicationController
   authorize_resource :conference_registrations, class: Registration
 
   def create
+    TicketPurchase.by_conference(@conference).unpaid.by_user(current_user).destroy_all
     message = TicketPurchase.purchase(@conference, current_user, params[:tickets][0])
     if message.blank?
-      if current_user.ticket_purchases.any?
-        redirect_to conference_conference_registration_path(@conference.short_title),
-                    notice: "Thank you for supporting #{@conference.title} by purchasing a ticket."
+      if current_user.ticket_purchases.by_conference(@conference).unpaid.any?
+        redirect_to new_conference_payment_path, notice: 'Please pay here to purchase tickets.'
       else
         redirect_to conference_conference_registration_path(@conference.short_title)
       end
diff --git a/app/helpers/payments_helper.rb b/app/helpers/payments_helper.rb
new file mode 100644
index 00000000..472debd2
--- /dev/null
+++ b/app/helpers/payments_helper.rb
@@ -0,0 +1,9 @@
+module PaymentsHelper
+  def months
+    (1..12).collect{|n| ["#{n} - #{Date::MONTHNAMES[n]}", n]}
+  end
+
+  def years
+    (Date.current.year..Date.current.year + 15)
+  end
+end
diff --git a/app/models/ability.rb b/app/models/ability.rb
index 76e1fc4c..a497fe95 100644
--- a/app/models/ability.rb
+++ b/app/models/ability.rb
@@ -81,6 +81,7 @@ class Ability
 
     can :index, Ticket
     can :manage, TicketPurchase, user_id: user.id
+    can [:new], Payment, user_id: user.id
 
     can [:create, :destroy], Subscription, user_id: user.id
 
diff --git a/app/models/conference.rb b/app/models/conference.rb
index 9079bd71..ad95e902 100644
--- a/app/models/conference.rb
+++ b/app/models/conference.rb
@@ -20,6 +20,7 @@ class Conference < ActiveRecord::Base
   has_one :program, dependent: :destroy
   has_one :venue, dependent: :destroy
   has_many :ticket_purchases, dependent: :destroy
+  has_many :payments, dependent: :destroy
   has_many :supporters, through: :ticket_purchases, source: :user
   has_many :tickets, dependent: :destroy
 
diff --git a/app/models/payment.rb b/app/models/payment.rb
new file mode 100644
index 00000000..d8c1dfd6
--- /dev/null
+++ b/app/models/payment.rb
@@ -0,0 +1,59 @@
+class Payment < ActiveRecord::Base
+  has_many :ticket_purchases
+  belongs_to :user
+  belongs_to :conference
+
+  attr_accessor :credit_card_number
+  attr_accessor :credit_card_type
+  attr_accessor :card_verification_value
+  attr_accessor :expiration_month
+  attr_accessor :expiration_year
+
+  validates :full_name, presence: true
+  validates :credit_card_number, presence: true
+  validates :card_verification_value, presence: true, length: { minimum: 3, maximum: 4 }
+  validates :expiration_month, presence: true, numericality: { greater_than_or_equal_to: 1, less_than_or_equal_to: 12 }
+  validates :expiration_year, presence: true
+  validates :amount, presence: true, numericality: { greater_than: 0 }
+  validates :user_id, presence: true
+  validates :conference_id, presence: true
+
+  enum status: {
+    unpaid: 0,
+    success: 1,
+    failure: 2
+  }
+
+  def credit_card
+    @credit_card ||= ActiveMerchant::Billing::CreditCard.new(
+      name:                full_name,
+      number:              credit_card_number,
+      month:               expiration_month,
+      year:                expiration_year,
+      verification_value:  card_verification_value
+    )
+  end
+
+  def amount_to_pay
+    Ticket.total_price(conference, user, paid: false).cents
+  end
+
+  def purchase
+    gateway_response = begin
+      GATEWAY.purchase(amount_to_pay, credit_card, currency: conference.tickets.first.price_currency)
+    rescue
+      ActiveMerchant::Billing::Response.new(false, 'Unable to receive any response from the payment gateway.')
+    end
+
+    if gateway_response.success?
+      self.last4 = credit_card.display_number
+      self.authorization_code = gateway_response.authorization
+      self.status = 'success'
+    else
+      errors.add(:base, gateway_response.message)
+      self.status = 'failure'
+    end
+
+    success?
+  end
+end
diff --git a/app/models/ticket.rb b/app/models/ticket.rb
index 54f5c3d7..d2454b74 100644
--- a/app/models/ticket.rb
+++ b/app/models/ticket.rb
@@ -18,24 +18,27 @@ class Ticket < ActiveRecord::Base
   end
 
   def paid?(user)
-    ticket_purchases.find_by(user: user, paid: true).present?
+    ticket_purchases.paid.by_user(user).present?
   end
 
-  def quantity_bought_by(user)
-    result = ticket_purchases.where(user_id: user.id).first
-    result ? result.quantity : 0
+  def quantity_bought_by(user, paid: false)
+    ticket_purchases.by_user(user).where(paid: paid).sum(:quantity)
   end
 
-  def total_price(user)
-    quantity_bought_by(user) * price
+  def unpaid?(user)
+    ticket_purchases.unpaid.by_user(user).present?
   end
 
-  def self.total_price(conference, user)
+  def total_price(user, paid: false)
+    quantity_bought_by(user, paid: paid) * price
+  end
+
+  def self.total_price(conference, user, paid: false)
     tickets = Ticket.where(conference_id: conference.id)
     result = nil
     begin
       tickets.each do |ticket|
-        price = ticket.total_price(user)
+        price = ticket.total_price(user, paid: paid)
         if result
           result +=  price unless price.zero?
         else
diff --git a/app/models/ticket_purchase.rb b/app/models/ticket_purchase.rb
index 8b0cd555..b7a8951f 100644
--- a/app/models/ticket_purchase.rb
+++ b/app/models/ticket_purchase.rb
@@ -7,23 +7,24 @@ class TicketPurchase < ActiveRecord::Base
 
   validates_numericality_of :quantity, greater_than: 0
 
-  validates_uniqueness_of :user_id,
-                          scope: :ticket_id,
-                          message: 'already bought this ticket!'
-
   delegate :title, to: :ticket
   delegate :description, to: :ticket
   delegate :price, to: :ticket
   delegate :price_cents, to: :ticket
   delegate :price_currency, to: :ticket
 
+  scope :paid, -> { where(paid: true) }
+  scope :unpaid, -> { where(paid: false) }
+  scope :by_conference, -> (conference) { where(conference_id: conference.id) }
+  scope :by_user, -> (user) { where(user_id: user.id) }
+
   def self.purchase(conference, user, purchases)
     errors = []
     ActiveRecord::Base.transaction do
       conference.tickets.each do |ticket|
         quantity = purchases[ticket.id.to_s].to_i
         # if the user bought the ticket, just update the quantity
-        if ticket.bought?(user)
+        if ticket.bought?(user) && ticket.unpaid?(user)
           purchase = update_quantity(conference, quantity, ticket, user)
         else
           purchase = purchase_ticket(conference, quantity, ticket, user)
@@ -48,7 +49,8 @@ class TicketPurchase < ActiveRecord::Base
   def self.update_quantity(conference, quantity, ticket, user)
     purchase = TicketPurchase.where(ticket_id: ticket.id,
                                     conference_id: conference.id,
-                                    user_id: user.id).first
+                                    user_id: user.id,
+                                    paid: false).first
 
     purchase.quantity = quantity if quantity > 0
     purchase
diff --git a/app/models/user.rb b/app/models/user.rb
index d3c847a2..4878ed9a 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -38,6 +38,7 @@ class User < ActiveRecord::Base
   has_many :registrations, dependent: :destroy
   has_many :events_registrations, through: :registrations
   has_many :ticket_purchases, dependent: :destroy
+  has_many :payments, dependent: :destroy
   has_many :tickets, through: :ticket_purchases, source: :ticket
   has_many :votes, dependent: :destroy
   has_many :voted_events, through: :votes, source: :events
diff --git a/app/views/conference_registrations/show.html.haml b/app/views/conference_registrations/show.html.haml
index 30cb281b..24923d07 100644
--- a/app/views/conference_registrations/show.html.haml
+++ b/app/views/conference_registrations/show.html.haml
@@ -89,29 +89,27 @@
           %span.fa-stack
             %i.fa.fa-square-o.fa-stack-2x
             %i.fa.fa-ticket.fa-stack-1x
-          Tickets
+          Ticket Purchases
           -if @tickets.any?
-            = "(#{@total_price} #{@tickets.first.price.symbol})"
+            = "(#{@tickets.first.price.symbol}#{humanized_money @total_price})"
         %ul
-          - @tickets.each do |ticket|
-            %li
-              = ticket.quantity
-              = ticket.title
-              = word_pluralize(ticket.quantity, 'Ticket')
-              for
-              = humanized_money ticket.price
-              = ticket.price.symbol
-              = link_to conference_ticket_purchase_path(@conference.short_title, ticket.id), method: :delete,
-                                                                                            id: "ticket-#{ticket.id}-delete",
-                                                                                            class: 'btn btn-danger btn-xs',
-                                                                                            data: { confirm: "Do you really want to delete the #{ticket.title} ticket for #{@conference.title}?" } do
-                %i.fa.fa-trash-o
-          %li
-            - if @tickets.any?
-              = link_to 'Buy more tickets', conference_tickets_path(@conference.short_title)
-            - else
-              You haven't bought any tickets.
-              = link_to 'Please buy some tickets to support us!', conference_tickets_path(@conference.short_title)
+          .col-md-12
+            - @ticket_payments.each_pair do |ticket_id, tickets|
+              %li
+                = @total_quantity[ticket_id]
+                = tickets.first.title
+                = word_pluralize(@total_quantity[ticket_id], 'Ticket')
+                for
+                = tickets.first.price.symbol
+                = humanized_money tickets.first.price
+            %br
+          - if @tickets.any?
+            = link_to 'Buy more tickets', conference_tickets_path(@conference.short_title), class: "btn btn-default"
+          - else
+            You haven't bought any tickets.
+            = link_to 'Please buy some tickets to support us!', conference_tickets_path(@conference.short_title)
+            %p
+              (Your registration won't be complete without buying a ticket)
 
   .row
     .col-md-12
diff --git a/app/views/payments/_payment.html.haml b/app/views/payments/_payment.html.haml
new file mode 100644
index 00000000..db508369
--- /dev/null
+++ b/app/views/payments/_payment.html.haml
@@ -0,0 +1,25 @@
+= semantic_form_for(@payment, url: conference_payments_path) do |f|
+  .form-group
+    = f.label :full_name, 'Full name (as on card)'
+    = f.text_field :full_name, class: "form-control", placeholder: "John Doe", id: "full_name"
+  %span.pull-right
+    %img.img-responsive{:src => image_url('credit_card.png')}
+  .form-group
+    = f.label :credit_card_number, "Credit Card number (without spaces)"
+    .input-group
+      = f.text_field :credit_card_number, class: "form-control", placeholder: "XXXX XXXX XXXX XXXX", id: "credit_card_number"
+      %span.input-group-addon
+        %i.fa.fa-credit-card
+  .form-group.col-md-6
+    = f.label :expiration_month
+    = f.select :expiration_month, months, {}, class: "form-control", id: "expiration_month"
+  .form-group.col-md-6
+    = f.label :expiration_year
+    = f.select :expiration_year, years, {}, class: "form-control", id: "expiration_year"
+  .form-group.col-md-10
+    = f.label :card_verification_value, 'Security Code (3 on back, AmEx: 4 on front)'
+    = f.text_field :card_verification_value, class: "form-control", placeholder: "XXX", id: "card_verification_value"
+    = f.number_field :amount, value: @total_amount_to_pay, class: "form-control", type: 'hidden'
+  .form-group.text-center
+    = f.submit "Pay #{number_to_currency @total_amount_to_pay, unit: @total_amount_to_pay.symbol}", class: "btn btn-primary", id: "Charge Card"
+    = link_to "Cancel", conference_conference_registration_path, class: "btn btn-danger"
diff --git a/app/views/payments/new.html.haml b/app/views/payments/new.html.haml
new file mode 100644
index 00000000..f7e4fc36
--- /dev/null
+++ b/app/views/payments/new.html.haml
@@ -0,0 +1,14 @@
+.container
+  .row
+    .col-xs-6.col-xs-offset-3
+      %h1
+        Buy tickets for
+        = @total_amount_to_pay.symbol
+        = humanized_money @total_amount_to_pay
+      - if @payment.errors.any?
+        .alert.alert-danger
+          %ul
+            - @payment.errors.full_messages.each do |msg|
+              %li= msg
+    .col-xs-6.col-xs-offset-3.well
+      = render partial: 'payment'
diff --git a/app/views/tickets/_ticket.html.haml b/app/views/tickets/_ticket.html.haml
index 1a93f46b..e3985773 100644
--- a/app/views/tickets/_ticket.html.haml
+++ b/app/views/tickets/_ticket.html.haml
@@ -8,12 +8,8 @@
         - unless ticket.description.blank?
           = markdown(ticket.description)
   %td.col-sm-1.col-md-1
-    - if ticket.bought?(current_user)
-      = text_field_tag("tickets[][#{ticket.id}]", ticket.quantity_bought_by(current_user),
+    = text_field_tag("tickets[][#{ticket.id}]", 0,
       type: 'number', min: 0, class: "form-control quantity", 'data-id' => ticket.id)
-    - else
-      = text_field_tag("tickets[][#{ticket.id}]", 0, type: 'number', min: 0,
-      class: "form-control quantity", 'data-id' => ticket.id)
   %td.col-sm-1.col-md-1.text-center
     = ticket.price.symbol
     %span{id: "price_#{ticket.id}"}
diff --git a/app/views/tickets/index.html.haml b/app/views/tickets/index.html.haml
index fbc2df7c..8f80e1ac 100644
--- a/app/views/tickets/index.html.haml
+++ b/app/views/tickets/index.html.haml
@@ -5,10 +5,10 @@
         %h1
           Tickets
       %p.lead
-        If you like, support
+        Please choose your tickets for 
         %strong
           = @conference.title
-        by buying a ticket*
+        here*
       =form_tag(conference_ticket_purchases_path, method: :post) do |f|
         %table.table.table-hover
           %thead
@@ -35,12 +35,11 @@
         .pull-right
           .btn-group-vertical
             = button_tag(type: 'submit', class: 'btn btn-success btn-lg') do
-              Support
+              Continue
               %i.fa.fa-shopping-cart
-            = link_to 'Continue without a Ticket!', conference_conference_registration_path(@conference.short_title),
-            class: 'btn btn-danger btn-sm'
+            = link_to 'Cancel registration', conference_conference_registration_path(@conference.short_title), method: :delete, class: 'btn btn-danger btn-sm'
   .row
     .col-md-13
       %p.text-muted.text-center
         %small
-          * Buying a ticket is not mandatory. Checkout will be at the conference registration.
+          * Buying a ticket is mandatory. Your registration will not complete until you buy a ticket.
diff --git a/config/environments/development.rb b/config/environments/development.rb
index 61d9fd57..126a7ea1 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -96,4 +96,10 @@ Osem::Application.configure do
     end
   end
 
+  #Initialize Payment Gateway with valid credentials
+  ActiveMerchant::Billing::Base.mode = :test
+  ::GATEWAY = ActiveMerchant::Billing::StripeGateway.new(:login => ENV['OSEM_GATEWAY_TEST_SECRET_KEY'])
 end
+
+
+
diff --git a/config/environments/production.rb b/config/environments/production.rb
index d2b43a46..92090758 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -83,4 +83,8 @@ Osem::Application.configure do
 
   # Set the secret_key_base from the env, if not set by any other means
   config.secret_key_base ||= ENV["SECRET_KEY_BASE"]
+
+  # Initialize Payment Gateway with valid credentials
+  ActiveMerchant::Billing::Base.mode = :test
+  ::GATEWAY = ActiveMerchant::Billing::StripeGateway.new(:login => ENV['OSEM_GATEWAY_LIVE_SECRET_KEY'])
 end
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 68c74dab..a6935e24 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -52,4 +52,9 @@ Osem::Application.configure do
     ActiveSupport::Deprecation.silenced = true
   end
 
+  # Initialize Payment Gateway with valid credentials
+  ActiveMerchant::Billing::Base.mode = :test
+    ::GATEWAY = ActiveMerchant::Billing::BogusGateway.new
 end
+
+
diff --git a/config/routes.rb b/config/routes.rb
index a2bd18a6..cf3f7a5a 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -111,6 +111,7 @@ Osem::Application.routes.draw do
     resource :conference_registration, path: 'register'
     resources :tickets, only: [:index]
     resources :ticket_purchases, only: [:create, :destroy]
+    resources :payments, only: [:index, :new, :create]
     resource :subscriptions, only: [:create, :destroy]
 
     member do
diff --git a/db/migrate/20160606040848_create_payments.rb b/db/migrate/20160606040848_create_payments.rb
new file mode 100644
index 00000000..20350d95
--- /dev/null
+++ b/db/migrate/20160606040848_create_payments.rb
@@ -0,0 +1,15 @@
+class CreatePayments < ActiveRecord::Migration
+  def change
+    create_table :payments do |t|
+      t.string :full_name, null: false
+      t.string :last4
+      t.integer :amount, null: false
+      t.string :authorization_code
+      t.integer :status, default: 0, null: false
+      t.integer :user_id, null: false
+      t.integer :conference_id, null: false
+
+      t.timestamps null: false
+    end
+  end
+end
diff --git a/db/migrate/20160610073948_add_payment_id_to_ticket_purchases.rb b/db/migrate/20160610073948_add_payment_id_to_ticket_purchases.rb
new file mode 100644
index 00000000..133a047b
--- /dev/null
+++ b/db/migrate/20160610073948_add_payment_id_to_ticket_purchases.rb
@@ -0,0 +1,5 @@
+class AddPaymentIdToTicketPurchases < ActiveRecord::Migration
+  def change
+    add_column :ticket_purchases, :payment_id, :integer
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 120ea7e5..ce12dc29 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -250,6 +250,18 @@ ActiveRecord::Schema.define(version: 20160624151257) do
     t.datetime "updated_at"
   end
 
+  create_table "payments", force: :cascade do |t|
+    t.string   "full_name",                      null: false
+    t.string   "last4"
+    t.integer  "amount",                         null: false
+    t.string   "authorization_code"
+    t.integer  "status",             default: 0, null: false
+    t.integer  "user_id",                        null: false
+    t.integer  "conference_id",                  null: false
+    t.datetime "created_at",                     null: false
+    t.datetime "updated_at",                     null: false
+  end
+
   create_table "programs", force: :cascade do |t|
     t.integer  "conference_id"
     t.integer  "rating",            default: 0
@@ -399,6 +411,7 @@ ActiveRecord::Schema.define(version: 20160624151257) do
     t.datetime "created_at"
     t.integer  "quantity",      default: 1
     t.integer  "user_id"
+    t.integer  "payment_id"
   end
 
   create_table "tickets", force: :cascade do |t|
diff --git a/spec/controllers/conference_registration_controller_spec.rb b/spec/controllers/conference_registration_controller_spec.rb
index 2d67b228..4e07dff1 100644
--- a/spec/controllers/conference_registration_controller_spec.rb
+++ b/spec/controllers/conference_registration_controller_spec.rb
@@ -40,9 +40,8 @@ describe ConferenceRegistrationsController, type: :controller do
           get :show, conference_id: conference.short_title
         end
 
-        it 'assigns price of purchased tickets to total_price and purchased tickets to tickets' do
-          expect(assigns(:total_price)).to eq Money.new(10000, 'USD')
-          expect(assigns(:tickets)).to match_array [@purchased_ticket]
+        it 'does not assign price of purchased tickets to total_price and purchased tickets to tickets without payment' do
+          expect(assigns(:total_price)).to eq Money.new(0, 'USD')
         end
       end
 
diff --git a/spec/factories/payments.rb b/spec/factories/payments.rb
new file mode 100644
index 00000000..4f0ef7a1
--- /dev/null
+++ b/spec/factories/payments.rb
@@ -0,0 +1,20 @@
+FactoryGirl.define do
+  factory :payment do
+    user
+    conference
+    full_name { Faker::Hipster.word.to_s }
+    credit_card_number '4242424242424111'
+    card_verification_value '123'
+    expiration_month 6
+    expiration_year { Date.current.year + 2 }
+    amount 10
+  end
+
+  trait :invalid_credit_card do
+    credit_card_number '4242424242424222'
+  end
+
+  trait :exception_credit_card do
+    credit_card_number '4242424242424333'
+  end
+end
diff --git a/spec/features/payments_spec.rb b/spec/features/payments_spec.rb
new file mode 100644
index 00000000..d9ef69dd
--- /dev/null
+++ b/spec/features/payments_spec.rb
@@ -0,0 +1,112 @@
+require 'spec_helper'
+
+feature Registration do
+  let!(:ticket) { create(:ticket) }
+  let!(:conference) { create(:conference, title: 'ExampleCon', tickets: [ticket], registration_period: create(:registration_period, start_date: 3.days.ago)) }
+  let!(:participant) { create(:user) }
+
+  context 'as a participant' do
+    before(:each) do
+      sign_in participant
+    end
+
+    after(:each) do
+      sign_out
+    end
+
+    context 'who is not registered' do
+
+      scenario 'purchases and pays for a ticket, with gateway producing error', feature: true, js: true do
+        visit root_path
+        click_link 'Register'
+
+        expect(current_path).to eq(new_conference_conference_registration_path(conference.short_title))
+        click_button 'Register'
+
+        fill_in "tickets__#{ticket.id}", with: '2'
+        expect(current_path).to eq(conference_tickets_path(conference.short_title))
+
+        click_button 'Continue'
+
+        expect(current_path).to eq(new_conference_payment_path(conference.short_title))
+        expect(flash).to eq('Please pay here to purchase tickets.')
+        purchase = TicketPurchase.where(user_id: participant.id, ticket_id: ticket.id).first
+        expect(purchase.quantity).to eq(2)
+
+        fill_in 'full_name', with: 'foo'
+        select Date.current.year + 2, from: 'expiration_year'
+        fill_in 'card_verification_value', with: '123'
+        fill_in 'credit_card_number', with: '4242424242423333'
+
+        click_button 'Charge Card'
+
+        expect(Payment.count).to eq(0)
+        expect(current_path).to eq(conference_conference_registration_path(conference.short_title))
+      end
+
+      scenario 'purchases and pays for a ticket, with card producing a transaction failure', feature: true, js: true do
+        visit root_path
+        click_link 'Register'
+
+        expect(current_path).to eq(new_conference_conference_registration_path(conference.short_title))
+        click_button 'Register'
+
+        fill_in "tickets__#{ticket.id}", with: '2'
+        expect(current_path).to eq(conference_tickets_path(conference.short_title))
+
+        click_button 'Continue'
+
+        expect(current_path).to eq(new_conference_payment_path(conference.short_title))
+        expect(flash).to eq('Please pay here to purchase tickets.')
+        purchase = TicketPurchase.where(user_id: participant.id, ticket_id: ticket.id).first
+        expect(purchase.quantity).to eq(2)
+
+        fill_in 'full_name', with: 'foo'
+        select Date.current.year + 2, from: 'expiration_year'
+        fill_in 'card_verification_value', with: '123'
+        fill_in 'credit_card_number', with: '4242424242422222'
+
+        click_button 'Charge Card'
+
+        expect(Payment.count).to eq(0)
+        expect(current_path).to eq(conference_conference_registration_path(conference.short_title))
+      end
+
+      scenario 'purchases and pays for a ticket successfully', feature: true, js: true do
+        visit root_path
+        click_link 'Register'
+
+        expect(current_path).to eq(new_conference_conference_registration_path(conference.short_title))
+        click_button 'Register'
+
+        fill_in "tickets__#{ticket.id}", with: '2'
+        expect(current_path).to eq(conference_tickets_path(conference.short_title))
+
+        click_button 'Continue'
+
+        expect(current_path).to eq(new_conference_payment_path(conference.short_title))
+        expect(flash).to eq('Please pay here to purchase tickets.')
+        purchase = TicketPurchase.where(user_id: participant.id, ticket_id: ticket.id).first
+        expect(purchase.quantity).to eq(2)
+
+        fill_in 'full_name', with: 'foo'
+        select Date.current.year + 2, from: 'expiration_year'
+        fill_in 'card_verification_value', with: '123'
+        fill_in 'credit_card_number', with: '4242424242421111'
+
+        click_button 'Charge Card'
+
+        expect(current_path).to eq(conference_conference_registration_path(conference.short_title))
+        expect(Payment.count).to eq(1)
+        payment = Payment.where(user_id: participant, conference_id: conference.id).first
+        expect(payment.amount).to eq(20)
+        expect(payment.status).to eq('success')
+        expect(payment.first_name).to eq('foo')
+        expect(payment.last_name).to eq('bar')
+        expect(payment.last4).not_to be_empty
+        expect(payment.authorization_code).not_to be_empty
+        expect(flash).to eq('Thanks! You have purchased your tickets successfully.')
+      end
+    end
+  end
+end
diff --git a/spec/features/ticket_purchases_spec.rb b/spec/features/ticket_purchases_spec.rb
index ff6957f6..3d42473f 100644
--- a/spec/features/ticket_purchases_spec.rb
+++ b/spec/features/ticket_purchases_spec.rb
@@ -26,26 +26,12 @@ feature Registration do
         fill_in "tickets__#{ticket.id}", with: '2'
         expect(current_path).to eq(conference_tickets_path(conference.short_title))
 
-        click_button 'Support'
+        click_button 'Continue'
 
+        expect(current_path).to eq(new_conference_payment_path(conference.short_title))
+        expect(flash).to eq('Please pay here to purchase tickets.')
         purchase = TicketPurchase.where(user_id: participant.id, ticket_id: ticket.id).first
         expect(purchase.quantity).to eq(2)
-        expect(current_path).to eq(conference_conference_registration_path(conference.short_title))
-        expect(flash).
-            to eq("Thank you for supporting #{conference.title} by purchasing a ticket.")
-        expect(page.has_content?("2 #{ticket.title} Tickets for 10")).to be true
-      end
-
-      scenario 'deletes a purchased ticket', feature: true, js: true do
-        create(:registration, conference: conference, user: participant)
-        create(:ticket_purchase, conference: conference, user: participant, ticket: ticket, quantity: 4)
-
-        visit conference_conference_registration_path(conference.short_title)
-        expect(page.has_content?("4 #{ticket.title} Tickets for 10")).to be true
-
-        click_link "ticket-#{ticket.id}-delete"
-        expect(flash).to eq('Ticket successfully deleted.')
-        expect(TicketPurchase.count).to eq(0)
       end
     end
   end
diff --git a/spec/helpers/payments_helper_spec.rb b/spec/helpers/payments_helper_spec.rb
new file mode 100644
index 00000000..91feb177
--- /dev/null
+++ b/spec/helpers/payments_helper_spec.rb
@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+describe PaymentsHelper, type: :helper do
+  describe '#months' do
+    it 'returns the correct strings for months' do
+      expect(months).to match_array(Array([['1 - January', 1], ['2 - February', 2], ['3 - March', 3],
+                                           ['4 - April', 4], ['5 - May', 5], ['6 - June', 6],
+                                           ['7 - July', 7], ['8 - August', 8], ['9 - September', 9],
+                                           ['10 - October', 10], ['11 - November', 11], ['12 - December', 12]]))
+    end
+  end
+
+  describe '#years' do
+    it 'returns the correct set of options' do
+      expect(years).to match_array(Array(Date.current.year..Date.current.year + 15))
+    end
+  end
+end
diff --git a/spec/models/conference_spec.rb b/spec/models/conference_spec.rb
old mode 100755
new mode 100644
diff --git a/spec/models/payment_spec.rb b/spec/models/payment_spec.rb
new file mode 100644
index 00000000..0cce495e
--- /dev/null
+++ b/spec/models/payment_spec.rb
@@ -0,0 +1,148 @@
+require 'spec_helper'
+
+describe Payment do
+
+  context 'new payment' do
+    let(:payment) { create(:payment) }
+    it 'sets status to "unpaid" by default' do
+      expect(payment.status).to eq('unpaid')
+    end
+  end
+
+  describe 'validations' do
+    it 'has a valid factory' do
+      expect(build(:payment)).to be_valid
+    end
+
+    it { is_expected.to validate_presence_of(:full_name) }
+
+    it { is_expected.to validate_presence_of(:credit_card_number) }
+
+    it { is_expected.to validate_presence_of(:card_verification_value) }
+
+    it { is_expected.to validate_presence_of(:expiration_month) }
+
+    it { is_expected.to validate_presence_of(:expiration_year) }
+
+    it { is_expected.to validate_presence_of(:amount) }
+
+    it { is_expected.to validate_presence_of(:user_id) }
+
+    it { is_expected.to validate_presence_of(:conference_id) }
+
+    it 'is not valid with a amount equals zero' do
+      should_not allow_value(0).for(:amount)
+    end
+
+    it 'is not valid with a amount smaller than zero' do
+      should_not allow_value(-1).for(:amount)
+    end
+
+    it 'is valid with a amount greater than zero' do
+      should allow_value(1).for(:amount)
+    end
+
+  end
+
+  describe '#credit_card' do
+    let(:payment) { create(:payment) }
+
+    it 'assigns correct "month"' do
+      expect(payment.credit_card.month).to eq(6)
+    end
+
+    it 'assigns correct "year"' do
+      expect(payment.credit_card.year).to eq(Date.current.year + 2)
+    end
+
+    it 'assigns correct "verification_value"' do
+      expect(payment.credit_card.verification_value).to eq('123')
+    end
+
+    it 'assigns correct "card_number"' do
+      expect(payment.credit_card.display_number).to eq('XXXX-XXXX-XXXX-4111')
+    end
+  end
+
+  describe '#amount_to_pay' do
+    let!(:user) { create(:user) }
+    let!(:conference) { create(:conference) }
+    let(:ticket_1) { create(:ticket, price: 10, price_currency: 'USD', conference: conference) }
+    let(:payment) { create(:payment, user: user, conference: conference) }
+
+    it ' returns correct unpaid amount' do
+      create(:ticket_purchase, ticket: ticket_1, user: user, quantity: 8)
+      expect(payment.amount_to_pay).to eq(8000)
+    end
+  end
+
+  describe '#purchase' do
+    let!(:user) { create(:user) }
+    let!(:ticket_1) { create(:ticket) }
+    let!(:conference) { create(:conference, tickets: [ticket_1]) }
+    let!(:payment) { create(:payment, user: user, conference: conference) }
+
+    let!(:tickets) { {ticket_1.id.to_s => '1'} }
+
+    before { TicketPurchase.purchase(conference, user, tickets) }
+
+    context 'when the payment is successful' do
+      before { payment.purchase }
+
+      it 'returns true' do
+        payment_result = payment.purchase
+        expect(payment_result).to eq true
+      end
+
+      it "assigns 'success' to payment.status" do
+        expect(payment.status).to eq('success')
+      end
+
+      it 'assigns last4' do
+        expect(payment.last4).to eq('XXXX-XXXX-XXXX-4111')
+      end
+
+      it 'assigns authorization_code' do
+        expect(payment.authorization_code).to eq('53433')
+      end
+    end
+
+    context 'if the payment is not successful' do
+      before { payment.purchase }
+
+      let(:payment) { create(:payment, :invalid_credit_card) }
+
+      context 'when the card is invalid' do
+        it 'returns false' do
+          payment_result = payment.purchase
+          expect(payment_result).to eq false
+        end
+
+        it 'assigns "failure" to payment.status' do
+          expect(payment.status).to eq('failure')
+        end
+
+        it 'adds errors' do
+          expect(payment.errors[:base].count).to eq(1)
+        end
+      end
+
+      context 'when there is a connection problem with the gateway' do
+        let(:payment) { create(:payment, :exception_credit_card) }
+
+        it 'returns false' do
+          payment_result = payment.purchase
+          expect(payment_result).to eq false
+        end
+
+        it 'assigns "failure" to payment.status' do
+          expect(payment.status).to eq('failure')
+        end
+
+        it 'adds errors' do
+          expect(payment.errors[:base].count).to eq(1)
+        end
+      end
+    end
+  end
+end
diff --git a/spec/models/ticket_spec.rb b/spec/models/ticket_spec.rb
index fc67ff3d..631ca59a 100644
--- a/spec/models/ticket_spec.rb
+++ b/spec/models/ticket_spec.rb
@@ -82,31 +82,72 @@ describe Ticket do
     end
   end
 
-  describe '#quantity_bought_by' do
-    it 'returns the correct value if the user has bought this ticket' do
-      create(:ticket_purchase,
-             user: user,
-             ticket: ticket,
-             quantity: 20)
-      expect(ticket.quantity_bought_by(user)).to eq(20)
+  describe '#unpaid?' do
+    let!(:ticket_purchase) { create(:ticket_purchase, user: user, ticket: ticket) }
+
+    context 'user has not paid' do
+
+      it 'returns true' do
+        expect(ticket.unpaid?(user)).to eq(true)
+      end
     end
 
-    it 'returns zero if the user has not bought this ticket' do
-      expect(ticket.quantity_bought_by(user)).to eq(0)
+    context 'user has paid' do
+      before { ticket_purchase.update_attributes(paid: true) }
+
+      it 'returns false' do
+        expect(ticket.unpaid?(user)).to eq(false)
+      end
+    end
+  end
+
+  describe '#quantity_bought_by' do
+    context 'user has not paid' do
+      it 'returns the correct value if the user has bought this ticket' do
+        create(:ticket_purchase,
+               user: user,
+               ticket: ticket,
+               quantity: 20)
+        expect(ticket.quantity_bought_by(user, paid: false)).to eq(20)
+      end
+
+      it 'returns zero if the user has not bought this ticket' do
+        expect(ticket.quantity_bought_by(user, paid: false)).to eq(0)
+      end
+    end
+
+    context 'user has paid' do
+      let!(:ticket_purchase) { create(:ticket_purchase, user: user, ticket: ticket, quantity: 20) }
+      before { ticket_purchase.update_attributes(paid: true) }
+
+      it 'returns the correct value if the user has bought and paid for this ticket' do
+        expect(ticket.quantity_bought_by(user, paid: true)).to eq(20)
+      end
     end
   end
 
   describe '#total_price' do
-    it 'returns the correct value if the user has bought this ticket' do
-      create(:ticket_purchase,
-             user: user,
-             ticket: ticket,
-             quantity: 20)
-      expect(ticket.total_price(user)).to eq(Money.new(100000, 'USD'))
+    context 'user has not paid' do
+      it 'returns the correct value if the user has bought this ticket' do
+        create(:ticket_purchase,
+               user: user,
+               ticket: ticket,
+               quantity: 20)
+        expect(ticket.total_price(user, paid: false)).to eq(Money.new(100000, 'USD'))
+      end
+
+      it 'returns zero if the user has not bought this ticket' do
+        expect(ticket.total_price(user, paid: false)).to eq(Money.new(0, 'USD'))
+      end
     end
 
-    it 'returns zero if the user has not bought this ticket' do
-      expect(ticket.total_price(user)).to eq(Money.new(0, 'USD'))
+    context 'user has paid' do
+      let!(:ticket_purchase) { create(:ticket_purchase, user: user, ticket: ticket, quantity: 20) }
+      before { ticket_purchase.update_attributes(paid: true) }
+
+      it 'returns the correct value if the user has bought this ticket' do
+        expect(ticket.total_price(user, paid: true)).to eq(Money.new(100000, 'USD'))
+      end
     end
   end
 
@@ -116,7 +157,7 @@ describe Ticket do
     describe 'user has bought' do
       context 'no tickets' do
         it 'returns zero' do
-          expect(Ticket.total_price(conference, user)).to eq(Money.new(0, 'USD'))
+          expect(Ticket.total_price(conference, user, paid: false)).to eq(Money.new(0, 'USD'))
         end
       end
 
@@ -126,7 +167,7 @@ describe Ticket do
         end
 
         it 'returns the correct total price' do
-          expect(Ticket.total_price(conference, user)).to eq(Money.new(100000, 'USD'))
+          expect(Ticket.total_price(conference, user, paid: false)).to eq(Money.new(100000, 'USD'))
         end
       end
 
@@ -138,7 +179,7 @@ describe Ticket do
 
         it 'returns the correct total price' do
           total_price = Money.new(200000, 'USD')
-          expect(Ticket.total_price(conference, user)).to eq(total_price)
+          expect(Ticket.total_price(conference, user, paid: false)).to eq(total_price)
         end
       end
     end