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I have kept my validation database upto date, but why am I still getting invalid sortcode error messages?

When you validate a payment your software performs a modulus check. The check compares the sort codes in the submission to the sort codes in your database. Essentially it is a static database, the banks release their new sort code updates monthly and send them to us. We then convert them to a format our software can update to the database. Not all sort codes are recognised by the modulus check due to the information provided by the banks. They do not provide every single sort code.

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