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In order to delete or change a customers direct debit, users can navigate to Customers -> Customer Management -> Details and click on the Banking button and the click on Tokenise. A screen similar to below will be displayed. Here they can delete a customers existing direct debit information. If the existing payment information needs to be updated and the user has the payment information on hand, it can be done here too, however, the best method is to send the customer a direct debit link to get them to enter this information themselves.
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