Server side integration
Learn how to integrate your payments using the server-side integration options.
Unzer payment infrastructure is exposed through RESTful API (Unzer API). On the server side you can integrate your online solution with Unzer using direct API calls, PHP SDK and Java SDK. To familiarize yourself with the general concepts, first read the Unzer API basics section.
Learn about the Unzer API, how is it built, and how the common tasks like authentication, notifications and errors are handled.
Learn about the Unzer API resources and transactions and how to handle them with direct API calls.
Learn how to set up Unzer Java SDK and use it to perform transactions, manage resources, handle errors, etc.
Learn how to set up Unzer PHP SDK and use it to perform transactions, manage resources, handle errors, etc.
To understand the principles of the new Unzer API together with key differences between the old and new approach for a smooth transition to the new API, see API migration guide.