ValentinD

add_hook("InvoicePaid", 1, "change_date_on_invoice_paid"); must be changed to add_hook("InvoicePaidPreEmail", 1, "change_date_on_invoice_paid"); in order for the client to get the invoice with the updated date;

I have created a hook in case somebody is interested: function change_date_on_invoice_paid($params) { $postData = array( 'invoiceid' => $params['invoiceid'], 'date' => date("Y-m-d") ); $action = localAPI('UpdateInvoice', $postData); } add_hook("InvoicePaid", 1, "change_date_on_invoice_paid");

In many UE states, it is mandatory that all the sequential invoice numbers be in chronological order (reported to the issue date), but WHMCS does not cover this legal requirement. It is also a legal requirement that the invoice should be added to its issue date accounting month and this is also not covered by WHMCS. Let's say, for example, that I have three proforma invoices 1 for client 1, 2 for client 2 and 3 for client 3 issued on 21, 22, 23 of March. If client 3 pays his Proforma invoice on April 13th - we will have proforma 3 converted into invoice INV-1, issued on March 23rd; If client 2 pays his proforma invoice in May 12, we will have proforma 2 converted into invoice INV-2, issued on March 22nd If client 1 pays his proforma invoice in June 1st, we will have proforma 1 converted into invoice INV-3, issued on March 21st We now have the following invoices: INV1/2021-03-23 (converted in April 12th) INV2/2021-03-22 (converted in March 3rd) INV3/2021-03-21 (converted in June 1st) - the invoices are anything but chronological, which would make the WHMCS user liable for a fine. - all of the invoices are marked as issued in a month that is already closed, so they'll have to be added to the books later than the month they were supposed to. Both the WHMCS user and their client are liable for fines. There should be an built-in option or a hook that would change the Invoice date to the date it has been converted from proforma to invoice and all these problems will not exist no more.