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The below cards are demo dummy cards you can use to test taking orders with the testing server for Square payments.
Visa #
Number: 4111 1111 1111 1111 CVV: 111
Expire: 11/28*
Zip code: 90210**
Mastercard #
Number: 5105 1051 0510 5100 CVV: 111
Expire: 11/28*
Zip code: 90210**
* or any date in the future
** the testing server seems to default to US address settings despite the address you fill in so will ask for a Zip code, it has to be real so I have used a real California zip code
Further Payment cards #
A Full test payment card list is available along with values that will test card errors at:
https://developer.squareup.com/docs/devtools/sandbox/payments#web-and-mobile-client-testing