Guide Invoices FAQs Show all parts of this guide How do I pay an invoice? Can I have a payment book? Need to change your contact details? How do I set up a Direct Debit? How do I get a copy invoice? 2. Can I have a payment book? This payment option is no longer possible as we have stopped providing giro slips. You can set up a Direct Debit for the 1st of the month or use one of our other ways to pay.