There is more than one scenario that an account number (with sort code) will be deemed valid by the Sort Codes system. The system will return an overall validity status of yes or no, along with the production of a status code that will explain how the decision was reached. The validity of the account number is not proof that it exists, only that it passes the criteria specified for the sort code, and in the cases where the sort code is not found (i.e. one not covered by the software), the account is assumed to be valid.
Hopewiser will only support the Modulus Check processes defined within the Vocalink Modulus Checking specification. Any organisations not covered by the Vocalink specification may be added if the Modulus Check is the same as those methods laid down within the Vocalink specification.