Issue e-invoice + QR (Phase 2)

In Phase 2, simply posting the invoice makes Odoo send it to ZATCA automatically and return the QR code and acceptance status.

Path: Accounting ← Customers ← Invoices (create an invoice) ← Confirm/Post

1. Create the invoice, choose the customer and products with 15% VAT on each line.
2. Confirm the document type: Tax Invoice for a VAT-registered customer, or Simplified for B2C individuals.
3. Review that customer data (VAT/address) and company data are complete before posting.
4. Click Confirm; Odoo signs the invoice and sends it to ZATCA via EDI automatically.
5. Follow the Electronic Invoice / EDI Status: Sent → Accepted.
6. Confirm the QR code appears on the invoice PDF and carries seller, amount, and tax data.
7. A tax invoice goes through Clearance before delivery, while a simplified one is Reported within 24 hours.
8. Send the approved copy to the customer via Send & Print.