You don't need to change anything with your Direct Debits. All funds that ZIPZERO transfers to your billers, will be automatically taken into account by your Direct Debit.
When the due date for your bill comes, the amount taken by Direct Debit from your bank account will be automatically adjusted to take into account the amount paid via your ZIPZERO wallet.
When making a payment to a utility biller that you have set up as a Direct Debit, ensure you make the payment well in advance (we recommend 7 working days) of the date the Direct Debit has informed you they will take the money out of your account. This is to guarantee the payment arrives in time to be reflected in the Direct Debit.