The Coupa API
Coupa provides rich, robust access to read, edit, or integrate your data via a RESTful API. This UTF-8 XML based interface allows you to create, update, and take action on individual records within Coupa by making an HTTP request call. This documentation will provide details ranging from authentication, API methods, data inputs, outputs, and formats and best practices.
Coupa 23 API Docs
Looking for what changed between R22 and R23? Check out the Coupa 23 Integration Updates. Looking for R22 docs? Go to Old Formats