For the vendor APIs relating to KOTS, you’ll want to check out either our V3 Swagger Spec or the V3 Interactive API Console.
The Replicated Vendor API is available to create and manage applications, release, customers, licenses, and more.
We publish a swagger spec at https://api.replicated.com/vendor/v1/spec/vendor-api.json. We also have an interactive API console available at https://replicated-vendor-api.readme.io/v1.0/reference
Interacting with the Vendor API requires Finding your API Token and App ID.