whats billing address mean refers to the address linked to your payment method, such as a credit card or bank account. It’s used for verification purposes during online purchases to prevent fraud. If the billing address doesn’t match what’s on file with your bank, the transaction may be declined. Billing addresses can differ from shipping addresses, especially when sending gifts. Always double-check the billing address format—name, street, city, ZIP code—to avoid errors. Some payment gateways also use the billing address to calculate tax or shipping fees.