Create a module for Drupal Commerce to add Payment Method -- 2

For a site already developed, we need to add a payment method for the Drupal Commerce module. [login to view URL] The payment method is for the provider Klik and Pay ([login to view URL]). The module should be able to configure test payment method feature and production payment method. There is already something done in a sandbox: [login to view URL] Then the developer must consider this part of module and just improve it.