We require upfront payment on all Sales Orders, we are linked to Stripe for pay methods and I need a way to send the Sales Order or Proforma type invoice to the client with the payment link to collect prepayment while still being able to close out the sales order once product is received from supplier and shipped to the customer and thereby clearing the prepayment and closing a final invoice. 

I've done many searches, and only find options for other country versions (not US), or as a feature of other SAGE versions, I need a solution for SAGE 50 Quantum (US).