There are three integration guides for simple payment:

The Flex.API is small and simple. But you need to implement your own payment method selection.

Our Smart Checkout provides a ready-to-use checkout solution for pure payments or purchase orders. It is based on the secuconnect API. There are also SDKs for Java, PHP, JavaScript, and .Net to save effort during implementation and lifetime of your application.

Our secuconnect API can also be used to implement your custom checkout solution. You can integrate and extend your custom solution in very detail at the expense of more development work. Again the SDKs will help you to save effort.

Furthermore we offer ready-to-use shop modules for the most common shop systems.