Avoid repeating headers

app/services/mailbluster_manager.rb

@@ -1,13 +1,19 @@
 class MailblusterManager
   include HTTParty
   base_uri 'https://api.mailbluster.com/api/leads/'
+  @@auth_headers = {
+    headers: {
+      'Content-Type'  => 'application/json',
+      'Authorization' => ENV['MAILBLUSTER_API_KEY']
+    }
+  }
+
+  def query_api(method, user, body)
+    #TODO
+  end
 
   def self.create_lead(user)
-    options = {
-      headers: {
-        'Content-Type'  => 'application/json',
-        'Authorization' => ENV['MAILBLUSTER_API_KEY']
-      },
+    options = @@auth_headers.merge({
       body:    {
         'email'            => user.email,
         'firstName'        => user.name,
@@ -15,35 +21,26 @@ class MailblusterManager
         'subscribed'       => true,
         'tags'             => [ENV['OSEM_NAME'] || 'snapcon']
       }.to_json
-    }
+    })
     post('/', options).parsed_response
   end
 
   def self.edit_lead(user, add_tags: [], remove_tags: [], old_email: nil)
-    options = {
-      headers: {
-        'Content-Type'  => 'application/json',
-        'Authorization' => ENV['MAILBLUSTER_API_KEY']
-      },
+    options = @@auth_headers.merge({
       body:    {
         'email'      => user.email,
         'firstName'  => user.name,
         'addTags'    => add_tags,
         'removeTags' => remove_tags
       }.to_json
-    }
+    })
     email_hash = Digest::MD5.hexdigest(old_email.presence || user.email)
     put("/#{email_hash}", options).parsed_response
   end
 
   def self.delete_lead(user)
     email_hash = Digest::MD5.hexdigest user.email
-    options = {
-      headers: {
-        'Content-Type'  => 'application/json',
-        'Authorization' => ENV['MAILBLUSTER_API_KEY']
-      }
-    }
+    options = @@auth_headers
     delete("/#{email_hash}", options).parsed_response
   end
 end