What is the Zip code for the test Visa card ??
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When testing payments in the Square Sandbox, you can use any valid postal code for the test Visa card. For example, you can use a five-digit number like 94103.
This answer was reviewed by @Bryan-Square.
Thank you.
Maybe put that info on this page: Sandbox Payments
We’re constantly working to improve our features based on feedback like this, so I’ll be sure to share your request to the API product team. 