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I was automating with a php script the process to get access and refresh token. When playing with the second step using the code_verifier or the code_challenge I could consitently detect the "error": "invalid-token-request" response if I was using the code_verifier. All worked fine if I used also in the second step the code_challenge. ... Mehr anzeigen

I'm facing exact the idential issue. Using Postmaster or curl command, I always get  { "error": "invalid-token-request" } Here is the url request for reference: https://iam.viessmann.com/idp/v2/token? client_id= ....verified as per my account redirect_uri=http://localhost:4200/ grant_type=authorization_code code_verifier=2e21faa1-db2c-4d0b-a10f-575fd372bc8c-575fd372bc8c code= xxxx that's the code I received from step 1   Need to take a brake now to reflect... ... Mehr anzeigen