The payment due date cannot be customized per individual customer. The payment due date appearing on invoices is driven by the local policy and House Rules per country/region.
What customers can do is change their invoice frequency, so they can be billed in advance for services. The customer or community team can change the invoice frequency via the customer’s online account as shown below.
NOTE: Customers can only be billed in advance for their Fixed and Recurring Services. Customers will still be invoiced monthly, and expected to pay by the due date on the invoice, for all variable/one-off use charges.
NOTE: Once the invoice frequency has been changed and invoiced in advance, the invoice cannot be changed. The invoice frequency can be changed and will take affect on the next scheduled invoice. The customer will be responsible for the advance invoice in full by the due date on the invoice until the new invoice frequency takes effect.
Go to Account > Billing & Payments > Invoices Preferences > Billing Frequency: