An extra screen to show what the user might do/pay is always better. A confirmation screen.
For Vendors', its better to just let the customer type in the credit card number and click the pay button and everything is done in a second.
However, for the customer, it would be better to show an extra screen to know what will go on, for example a confirmation screen. I'm very surprised that no confirmation screen was there.
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Anonymous
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Anonymous commented
This suggestion is also a WCAG requirement per https://www.w3.org/WAI/WCAG20/quickref/20160105/#minimize-error-reversible