Thank you very much. The key for customer support reference: [deleted]
I have sent two e-mails, and the Ticket IDs are : 279793, 279789.
I think the design of the payment mechanism is very unreasonable:
1) Its payment amount is surprisingly customized and can be infinitely higher than the original price. I think payment and donation should be separated
2) The decimal point in the text box surprisingly moves to the right, otherwise, the maximum payment would be $63.75
