Subscriptions sub collection not being created in Firebase

[884k]

Describe the bug
When a user successfully pays for their subscription, only a 'checkout_sessions' and 'payment' subcollection is created in Firestore. There is supposed to be a 'subscriptions' subcollection that is created when a user succesfully pays for a subscription.

To Reproduce
Steps to reproduce the behavior, please provide code snippets or a repository:

Follow instructions provided
Log in and pay for subscription
Check Firestore

Additional Information
• I have already tried the solution mentioned in issue #630.
• Webhook events and logs indicate that the process completes successfully.
• This was executed in Test Mode.