modifed the implementation of the refresh token process #197
Add this suggestion to a batch that can be applied as a single commit. This suggestion is invalid because no changes were made to the code. Suggestions cannot be applied while the pull request is closed. Suggestions cannot be applied while viewing a subset of changes. Only one suggestion per line can be applied in a batch. Add this suggestion to a batch that can be applied as a single commit. Applying suggestions on deleted lines is not supported. You must change the existing code in this line in order to create a valid suggestion. Outdated suggestions cannot be applied. This suggestion has been applied or marked resolved. Suggestions cannot be applied from pending reviews. Suggestions cannot be applied on multi-line comments. Suggestions cannot be applied while the pull request is queued to merge. Suggestion cannot be applied right now. Please check back later.
to meet the rfc6749 guidelines.
https://datatracker.ietf.org/doc/html/rfc6749#section-6
rfc6749 section 6 mentions only "refresh_token" and "grant_type" are REQUIRED,
while the previous implementation requires "client_id" and "client_secret".