I have been guided here by Zendesk support, I am receiving the error Proxy error: {:code=>"UnprocessableEntity", :status=>"422", :title=>"Unprocessable Entity", :message=>"Failed to get installation and oauth information for app."} when I attempt to create a request to a 3rd party server, I have followed your extensive guide but still recieving the above.
Proxy error: UnprocessableEntity, Failed to get installation and oauth information for app
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From the OAuth Docs and sample request, I get the following response which looks to be as expected { "access_token":"e…w", "refresh_token":"GEb…XbL", "id_token":"eyJ…EoQ", "token_type":"Bearer", "expires_in":86400 }