I need a module created for WHMCS. In my opinion it would be fairly simple to create.
The module must add a button to the page where admin users can see an invoice.
This button must be names "Naar incassobureau".
After pressing this button, the system should send an e-mail containing all client information, the invoice itself (as pfd) to an e-mail address set in the source code of this module. After sending this e-mail, it should set the invoice to status " collections"
This is all that needs to be created.
Please let me know if there are any other questions about this project.