AVS mismatch occurs when the billing address entered for a credit card payment, does not match the billing address on file with the card issuer and therefore causes the transaction to be declined. If a credit card transaction is declined for this reason, the billing address for that credit card must be updated on the customer profile in Mariana Tek to match what the card issuer (bank) has on file.
We recommend that the customer reach out to their bank to confirm the address they have on file. The customer can then update the billing address on their own in their account on the website or iOS app, or they can have an employee update the billing address for them through the admin platform.