Pinterest v5 store refresh times.

[budzanowski]

Changes proposed in this Pull Request:

Closes # .

This Pull Request introduces several updates to the token handling and refreshing mechanisms in the Pinterest for WooCommerce plugin. Specifically, it enhances the security and reliability of the token storage by encrypting additional token data and updating the method and timing for refreshing tokens. These changes aim to improve the user experience and ensure continuous, secure operation of the plugin.

Screenshots:

Detailed test instructions:

1. Update the Pinterest for WooCommerce plugin to the latest version.
2. Navigate to the plugin settings and reconnect to Pinterest to ensure new token data is generated and encrypted.
3. Monitor the logs for any errors or issues during the token refresh process to ensure it's operating as expected.
4. Verify that the plugin continues to function correctly with Pinterest, with no interruption to service.

Additional details:

Changelog entry

Update - Enhanced token encryption and refresh mechanisms in the Pinterest for WooCommerce plugin.