Issue symptoms
When I attempt to obtain an access token, I receive the error:
{"error":"invalid_grant",
"error_description":"The provided access grant is invalid,
expired, or revoked (e.g. invalid assertion, expired authorization
token, bad end-user password credentials, or mismatching authorization
code and redirection URI).
Resolution steps
Check that the parameter used for the redirect URL is redirect_uri as shown below.
curl https://{subdomain}.zendesk.com/oauth/tokens \
-H "Content-Type: application/json" \
-d '{"grant_type": "authorization_code", "code": "{your_code}",
"client_id": "{your_client_id}", "client_secret": "{your_client_secret}",
"redirect_uri": "{your_redirect_url}", "scope": "read" }' \
-X POST
Important: The parameter must be
redirect_uri.
For more information, see the article: Using OAuth authentication with your application.