If you've not enabled Automated payments collection, you can instead manually request invoices for collection.
To manually request one or more invoices for collection...
1. Navigate to the Invoices page via the left menu bar
2. Ensure that you're viewing Pending invoices
Providing the customer(s) have an existing mandate, you're able to manually request collection of their invoice(s). You can do this for an individual customer or in bulk.
3. You can now manually request invoice collection
a). To request collection of an individual invoice, simply click Collect Now in the status column of the customer you would like to request payment for.
b). To request collection of multiple invoices, select the invoices using the checkbox to the left of each invoice row, click the Bulk Action button in the top right;
... and choose either Collect now or Collect on Due Date.