Issue in generating access token with custom OAuth 2.0 grant type
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Description
We followed doc [1] to configure a custom grant type in WSO2 APIM 3.2.0, but the custom-grant-1.0.0.jar given in doc[1] doesn't work properly, and we are unable to generate access token using the new mobile grant type by invoking the token API for any given Devportal application as seen below.

[1]: https://is.docs.wso2.com/en/5.9.0/learn/writing-a-custom-oauth-2.0-grant-type/#resources
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked custom OAuth 2.0 grant documentation and its custom-grant-1.0.0.jar resource, then reproduce the token API call for a Devportal application using the mobile grant type. Compare the result with the reported failure; done means the documented custom grant generates an access token.
Written by the indexing model from the issue text.
Assessment
- Domain
- api, authentication
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100