This page can be used to test the show promise that resolves with modifiers. It simulates the modifiers and the final price not being known for the first 5 seconds after showing the payment sheet. The payment sheet should be in the "spinning" mode. After the 5 seconds, the final price will be $2.00 with a modifier for visa cards that make the total $3.00.
Price: USD $1.00 (tentative)
No payment will be processed.