Case
Email that was used during the payment process should be associated with the one in the screen with an email input field
Solution
Create a screen and set the field type to Email. The system will automatically fill the field with the email used in the previous payment (Stripe or Paddle).
Guide:
1. Add a Title/Subtitle/Field screen to your Flow (before the Paywall screen)
2. Choose it's type "Email"
NOTE: If Stripe PaymentElement or ExpressCheckout is used where an email is not required, you need to specify an email screen in the funnel — this will update PlatformUser and StripeCustomer, and as a result, subscriptions can be searched by this email.
If you are using Paddle, email is mandatory.
Example
You can see a ready-to-use example here:
Custom Email Field Screen Demo