How do I localize the Field messages in another language?
Everthing in the Stripe field is automatically localized according to the language set in the browser of the person who is accessing it.
Is the ZIP code necessary? What if we use something different in my region?
The ZIP sub-field only appears when Stripe recognizes the card was issued in the United States. For other countries it might not appear at all, or might appear a corresponding sub-field appropriate for the country the card was issued in (for example Postal Code in the United Kingdom).
Where is the pay button?
The pay button was removed, the payment is made on form submission without requiring extra steps.