Drop most SpreeService classes

they just delegated method to other classes, no idea why or how that
would come in handy, feels like just more files and code to keep track of

lib/Spree_services/base.rb

@@ -9,26 +9,6 @@ def initialize(service_name, payload, config)
       @service_name = service_name
     end
 
-    def upsert_contact_with_account!
-      Integration::ContactAccount.new(config, payload[service_name]).upsert!
-    end
-
-    def upsert_lineitems!
-      Integration::LineItem.new(config, payload[service_name]).import!
-    end
-
-    def upsert_payments!
-      Integration::Payment.new(config, payload[service_name]).import!
-    end
-
-    def upsert_products!
-      Integration::Product.new(config, payload).import_from_order!
-    end
-
-    def upsert_order!
-      Integration::Order.new(config, payload).upsert!
-    end
-
     def handle_returns!
       Integration::Return.new(config, payload[service_name]).handle_all!
     end

lib/salesforce_integration.rb

@@ -3,9 +3,6 @@
 require 'restforce'
 
 require 'Spree_services/base'
-require 'Spree_services/order'
-require 'Spree_services/line_item'
-require 'Spree_services/payment'
 require 'Spree_services/return'
 
 require 'integrations/base'

salesforce_endpoint.rb

@@ -8,15 +8,15 @@ class SalesforceEndpoint < EndpointBase::Sinatra::Base
 
   ['/add_order', '/update_order'].each do |path|
     post path do
-      SpreeService::Order.new(@payload, @config).upsert_contact_with_account!
-      SpreeService::Order.new(@payload, @config).upsert_order!
+      Integration::ContactAccount.new(@config, @payload[:order]).upsert!
+      Integration::Order.new(@config, @payload).upsert!
 
       Integration::Product.new(@config, @payload).import_from_order!
 
-      SpreeService::Order.new(@payload, @config).upsert_lineitems!
-      SpreeService::Order.new(@payload, @config).upsert_payments!
+      Integration::LineItem.new(@config, @payload[:order]).import!
+      Integration::Payment.new(@config, @payload[:order]).import!
 
-      result 200, "Opportunity ##{@payload["order"]["id"]} sent to Salesforce"
+      result 200, "Opportunity # #{@payload["order"]["id"]} sent to Salesforce"
     end
   end