I sent a request to my device, but it's always 401, Another request can receive a response using the same authorization
If the same access token works for standard REST API requests and not REST Pay API requests, you may be using a merchant-generated token. Our REST Pay API only accepts OAuth-generated access tokens to authorize requests. We provide more information on using OAuth in our docs:
Or, if you are already using an OAuth-generated token, we have more troubleshooting steps for 401 errors here:
4 People are following this question.