Technologies are provided for supporting tenant customizations in a cloud computing platform. A standard application programming interface (API) can be defined to support a generic set of parameters that allow tenant-specified custom data to be passed to and from the standard API. The generic set of parameters allow the standard API to process requests and responses that include a payload that comprises tenant-specified custom data. The payload allows the tenant-specified custom data to be passed to and from the standard API. When a request is received at the cloud computing platform, a request payload of the request, that includes tenant-specified custom data, can be processed at the standard API, and a response can be sent from the cloud computing platform that includes a response payload that includes the tenant-specified custom data.