When the subcontractor has obtained proof or a receipt certifying that the holder has indeed received the request for payment under the conditions set out in article R. 2193-11 or that he has the postal notice certifying that the envelope has been refused or has not been collected by the holder, the subcontractor shall send his request for payment to the purchaser accompanied by this proof, the receipt or the postal notice.
The purchaser shall immediately send the holder a copy of the invoices produced by the subcontractor.