After you run a BACS direct debit file process, you can download its direct debit transmission file. The direct debit transmission file contains specific payment information, such as account numbers and paperless mandate instructions. You can send transmission files to your organisation’s bank via portable memory, an email attachment, or a website. You and your bank should decide the best way to communicate this information. Your bank communicates with BACS to transfer the funds from the constituent’s account to your organisation’s bank account.