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Hello, as I am not acquainted with postman (yet), after thorough checking of the documentation, I tried 'fetch (method post)' and 'http.post' without success again. The response still is" System error. Try again later." Maybe the enclosed headers help to pin down the problem.   Regards Jürgen       Payload of Post-Request with client_id and code_verifier substituted in this reply:                             ... Mehr anzeigen

Hello, referring to Rainers (r2h2) answer dating from 21.01.23. Following the instructions from Authentication , I created a code verifier and a code challenge via PKCE Code Generator , then logged in successfully via my user and password, which delivered an access token.   Step 2: Authorization code exchange Curl Using curl the error message depends on the sequence of parameters. If grant_type is first, I receive invalid_grant, as Rainer did. Angular Using an angular client ( this.http.post(viessmann_token_url, JSON.stringify(accessTokenRequestParameters), { headers }) the response is always "System error. Try again later."   Any help is highly appreciated!   Best regards Jürgen   ... Mehr anzeigen