Hello, Error 401 { "error": "invalid_client", "error_description": "Client Authentication failed" } when tryin to get Acceess Token. Going by the book! Made a sandbox app, using Postman, Authorisation: Basic Auth, entered username, entered secret Body: x-www-form-urlencoded, grand_type: "client_credentials" Entering data correctly, no spaces or anything like this. Tried entering secret "as is", with "-" symbols in between and without them. No effect. Why do I get the error? Can anybody help, please?
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