The AnyPay is an experience API amd created by the outsIDe-in method for APIs, following Client Centric Design/Double Diamond methods. The AnyPay service have a working OpenAPI 3.0 file offered as json and yaml under the routes /openapi/json and /openapi/yaml respectively.
Please inspect the swagger/routes.go for the routes. The /.ambassador-internal/openapi-docs/ is neccessary for a successful Ambassador API Edge Stack publishing of the API.