Sale Amount Payment Link

This module changes how the payment link wizard behaves when it is opened from a sale order.

• It looks at the sale order's transactions and keeps only the ones that are completed (done).
• If there are completed transactions and the sale order has no invoices yet, it searches for the related accounting entries (invoices) linked to those payments.
• It adds up the total amount of those entries, ignoring any that are cancelled.
• The payment link amount is then set to the sale order total minus that already-paid amount.

So, if a customer has already paid part of an order through a payment link, the next link you generate will only ask for the remaining balance instead of the full order amount. This avoids asking customers to pay twice for the same amount.

The change appears in the payment link wizard screen, which is opened from a sale order. It touches the payment.link.wizard model and reads data from sale.order and account.move. No new menus, buttons, or reports are added; the module only adjusts the default amount shown in the wizard.