1. Variable Payment Authorization: Additional authorization section for arrangements where payment amounts may vary

2. Joint Account Declaration: Required when the bank account is jointly held, requiring additional authorization

3. Service Reference: Reference numbers or identifiers related to the service being paid for

4. Direct Debit Guarantee: Optional but recommended section outlining the customer's rights under the direct debit system

5. Payment History Authorization: Optional section for authorizing access to payment history information

6. Alternative Contact Details: Secondary contact information for urgent communications or backup contact

1. Schedule A - Payment Schedule: Detailed breakdown of payment dates and amounts if fixed schedule is applicable

2. Schedule B - Terms and Conditions: Detailed terms and conditions of the direct debit arrangement if too lengthy for main document

3. Appendix 1 - Bank Account Validation Form: Additional form required by some banks for account verification

4. Appendix 2 - Identification Requirements: List of acceptable identification documents for account verification purposes