Bad user experience: Don't require fields on non-selected tabs.
When I click through from the email to the payment, it's defaulted to the debit card sub-tab. I filled out my info, realized it was for debit, and erased everything before clicking over to the credit tab and filling it out again. When I clicked the PAY button, nothing happened. No error message, no notice to the user. I tried a few more times, before checking the debit tab, which was citing "name" as a required field, even though that form wasn't being used.
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