Resolved: The product is not being assigned to the user, but the payment is logged properly in Stripe

[reygcalantaol]

Resolves #https://github.com/WPUserManager/wpum-stripe/issues/9

Description

The problem stems from the fact that Stripe's 'customer.subscription.created' and 'invoice.payment_succeeded' webhook events are triggered before the creation of the subscription record in 'wpum_stripe_subscriptions.' The solution is to force the 'customer.subscription.created' webhook event handler to create the subscription record.

Testing Instructions

1. Create a Stripe Product
2. Set up the Registration form to collect payment - https://wpusermanager.com/article/340-collecting-payment-on-registration/
3. See the described issue from the site's my-account page after the test purchase.

Pre-review Checklist

• Issue and pull request titles are properly formatted.
• Acceptance criteria have been satisfied and marked in the related issue.
• Unit tests are included (if applicable).
• Self-review of code changes has been completed.
• Self-review of UX changes has been completed.
• Review has been requested from @polevaultweb.