Customers can pay for your products on Zaap using their PayPal accounts, or their credit/debit cards.
Sometimes a bank will flag transactions that happen online (usually for small amounts). They can contact their bank and let them know what's happening.
They may not have enough funds on their debit card, or in their PayPal account, to make this transaction go through. PayPal may also be under the impression that their account has been hijacked, and is preventing them from making a purchase.
Your customer will need to contact PayPal's support team to move things forward.
They'll need to try purchasing in a different browser. If they still experience errors, they'll need to download the latest version of their Internet browser and try again.
If they're using a proxy server or VPN, they'll need to turn off the proxy or VPN and attempt the purchase again.
If they are being asked to enter their ZIP or Postal code, that means that their credit card provider is asking them to verify that they know the ZIP code attached to their card. This is an identity verification check - the card provider is making sure the card user is the card owner.
The ZIP Code or Postal code we need is the one stored by their credit card provider. They can contact their credit card provider if they are unsure about what it is.