We had at least one internal test before we paused this. Also we have lots of open tasks that might help assess this.
- T134446 - Recurring workflow needs fixes.
- T137730 - Improve line item display on hosted confirmation page.
- T135039 - Write automated tests
- T138013 - Distinguish legacy PayPal vs Express Checkout in our database. Add special cases where needed.
- T149525 - Two-factor auth may be incompatible with Express Checkout.