Documentation Documentations Looking for the B2B Platform? Head over to the Payer B2B Documentation Choose your solution Php SDK- B2C Platform With the SDK it is super easy to get started with the B2C Platform. An all-in-one package with all web services in a single integration. API The APIs are supported by a diverse range of platforms and may be used to fit your special needs and to benefit specific web services in a more customized way. Custom – B2C Platform The Custom Integration corresponds to the core layer and creates the opportunity to integrate Payer even for non-supported platforms and without any APIs.