CREST API Retirement
The CREST API documentation has been retired because the CREST API is no longer recommended for use and will be retired shortly. If you haven't already done so, you should update your apps and services to support the Partner Center REST API or Software Development Kit (SDK).
Here are some helpful links:
Get the SDK
Download the Partner Center SDK to build the same features provided in Partner Center in your own applications.
Get a console app to help you test, or a web store that's ready to customize and launch.
Configure your developer account, and set up Azure AD for authentication.
Instructions and code samples for all supported tasks using the Partner Center APIs, to help you get coding quickly.
Detailed reference information for the managed and REST APIs for Partner Center.
Partner Center Managed API Reference