Release testing instructions for WC Payments 4.6.0

Ensure no errors occur when changing subscription payment method via UPE checkout more than once in a session.

1. Ensure UPE is enabled (using the WCPay dev tools plugin or by enabling Additional Payment Methods).
2. Ensure WooCommerce Payments Subscriptions is enabled.
3. Create a simple monthly subscription product.
4. Purchase the subscription using a standard CC: 4242424242424242 (⚠️ don't use a saved card).
5. Navigate to My Account -> Subscriptions -> Change Payment.
6. Change the subscription payment method to a new card (you can use the same number with a different expiry date) or use a card number below (⚠️ don't use a saved card):
   • SCA card 4000002760003184
   • 3DS2 card 4000000000003220
7. Change the payment again to a new card as per step 5 & 6.
8. Confirm that the second payment method change has been successful.