I have configured all the configuration for apple signin. It is redirect to apple site to get username and password. after that in callback, it is showing like this

Acceptance Criteria

• invalid_client error from Apple token endpoint is caught and wrapped in a descriptive exception
• Package documentation explains how to correctly generate the client_secret JWT
• Optionally: provide a helper command or utility to generate/validate the client_secret

Test Coverage

• Unit test: invalid_client Apple response is caught and rethrown as a descriptive exception
• Integration test: correct client_secret generation flow does not trigger the error

WSJF Priority Score

• Score: 3.25
• User/Business Value: 5 (Recurring auth failure for misconfigured setups)
• Time Criticality: 4 (Steady stream of affected users)
• Risk Reduction/Opportunity Enablement: 4 (Better error handling reduces support burden)
• Job Size: 4 points (S — error handling + docs)
• Calculation: (5 + 4 + 4) ÷ 4 = 3.25