Issue with PayPal Course Purchases

Hello,
I am encountering some critical issues on my website, particularly concerning course purchases through PayPal. Users are experiencing difficulties in making purchases, and the error seems to be related to the insertion of the ID.

I would like to request your assistance in resolving this situation. I have also noticed the “The old standard will not be supported in 2023/11/30” notification and I am concerned about how this change may affect the situation.

Could you kindly provide me with further details regarding this notification and explain how I should proceed to ensure that my website remains compatible with PayPal after November 30, 2023? Additionally, could you assist me in resolving the issue with course purchases through PayPal?

Thank you in advance for your support and assistance.