Create WHMCS billing feature for our customers.

We use whmcs as our billing/provisioning system.
Some resellers even though they resell domains or other services from us, they need, our company to direct invoice the final customer.

They pay on behalf of customer at our whmcs but they don't want to invoice the customer. Instead the need to submit billing details of the final customer to us in order our company to invoice the final customer.

We need from you to create a feature at our whmcs, where the reseller on the final step can select to submit different billing details of the final customer, and print those billing details on the whmcs pdf invoice.

At our whmcs, pdf invoice is not used as an official invoicing record. Our accounting department based on what it sees on pdf generates the legal pdf invoice and its being emailed to the final customer.