In this case, the card number should have ended in a 3 because 67 + 3 = 70, a multiple of 10. This particular dance of digits has come to dominate credit card verification because of its simplicity ...
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PayPal credit card processing: How to accept card payments with PayPal
To accept credit cards with PayPal, set up a business account, connect to PayPal’s payment gateway, and use PayPal Zettle for in-person or online payments.
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