I am trying to get the access token using attach code but it shows error of “Invalid Client”.

Error:


Connected Application:

I am trying to get the access token using attach code but it shows error of “Invalid Client”.

Error:


Connected Application:

Best answer by kpopova
You need to use HTTPS. See details in https://help.acumatica.com/Help?ScreenId=ShowWiki&pageid=84e7f6c6-3b0f-4526-a1aa-343e39aeebfe.
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