OAuth: Automatically Refresh Token on Expiry

[n7studios]

Summary

Reduces the likelihood of 401 unauthorized requests being sent to the Kit API by scheduling a WordPress cron event to refresh an expired access token on its expiry.

Presently, the Plugin relies on logic to check if an API request returns a 401 error with the message The access token expired. On lower traffic sites - for example, where there are not many customers subscribing or purchases being sent to Kit - this isn't a reliable method, as a call to the API won't always be triggered.

Testing

• testCronEventCreatedWhenAccessTokenObtained: Test that the convertkit_refresh_token event is scheduled when OAuth first completes and the Plugin receives access and refresh tokens.
• testCronEventCreatedWhenTokenRefreshed: Test that the convertkit_refresh_token event is scheduled when the access token is refreshed.

Checklist

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

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