Is this my store or the customer?
Currency gbp Failure code incorrect_zip Failure message The zip code you supplied failed validation
This is what I see from abandoned checkout... the postcode IS a valid one as a longstanding customer before my shopify site.
Thanks for getting in touch. This error usually occurs when the postcode or ZIP code the customer has entered does not match the one that is on file with their credit card company. When the information is submitted to the cardholder's bank the discrepancy means verification cannot be completed and the transaction fails as a result.
This is part of our Address Verification System (AVS) that you can enable when configuring Shopify Payments, and is a fraud prevention measure. I would recommend informing the customer that their checkout is likely failing due to this reason and that they should check that the postcode they are providing matches the one on file with their bank.
Are you using Shopify Payments or a third-party payment provider to accept credit card payments? What error message are you seeing in the abandoned checkout timeline, if any?
Is this order one that contains a UK address? If so, where in the UK is this zipcode (e.g. England, Scotland, etc)? Do you have all countries and regions in the UK enabled in your shipping settings as shown below?
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