Two-weeks-overdue freelance invoice nudge

A freelance invoice is now two weeks overdue. I've already sent the first polite reminder. Help me draft a second nudge that's firmer but doesn't burn the relationship.

Client: {{client_name}}
Invoice + amount: {{invoice_ref}} — {{amount}}
Original due date: {{due_date}}
What I've sent so far (date + summary): {{prior_messages}}
Have they replied at all to prior messages? {{any_reply}}
Will I keep working with them after this is paid? {{future_intent}}
Optional: anything I know about why (cashflow / forgot / unhappy): {{context}}

Write a 100–130 word email.
- Subject: "{{invoice_ref}} — payment update?"
- Open: name the invoice, amount, original due date in 1 line.
- Acknowledge the prior reminders without making them feel chased.
- State a clear ask: pay by {{ask_date}} or reply with a payment plan.
- If {{future_intent}} = no, can hint that ongoing work is paused until cleared.
- Close warmly: assume the best until proven otherwise.
- Sign-off as {{your_name}}.

AU English. Polite, professional. No "I'm sure this is just an oversight" (used too many times already).