Job description
I will commission a module integrating wfirma.pl with WHMCS system. The main assumptions are that after paying the proforma, the client should receive a VAT invoice from wfirma by email. In addition, such an invoice should be available for download from the WHMCS panel.
In addition, the module should be able to issue invoices with EU VAT, OSS and invoices for customers/companies outside the European Union.
In addition, we would need to verify the IP address with the customer's country and record it in the database (registration IP address) to issue OSS invoices (concerning only EU countries) and verify that the address exists (each country).