We have tried using the api spec GitHub - Dwolla/dwolla-openapi: An OpenAPI specification for the Dwolla API. https://developers.dwolla.com to generate the client side code. According to documentation it has mentioned that all the api calls should supply “Accept: application/vnd.dwolla.v1.hal+json” header but it is not working. We have supplied “application/json” and it worked. Please help us to clarify and also if you can provide lates api spec to generate the client apis to consume in our application.