Merge Tokens in Invoice Payment Instructions

Support template tokens (e.g. {customer_name}, {customer_reference}, {invoice_number}, {due_date}, {amount_due}) inside the invoice payment instructions text block. Write the payment text once with dynamic placeholders that auto-fill per invoice.

Particularly useful for manual bank transfer flows where users want to instruct customers to include a specific reference on the transfer (e.g. "Please use reference {customer_reference} on the payment") so incoming transfers can be matched back to the right customer or invoice.