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e6b288c291
Implementation of UBL 2.1 invoice generation to comply with Belgium's 2026 Peppol mandate. Key changes: - Add num-num/ubl-invoice dependency via composer.json - Create Ubl_generator library to convert OSPOS sale data to UBL format - Create country_helper.php to map country names to ISO 3166-1 alpha-2 codes - Extend Email_lib to support multiple attachments for PDF+UBL emails - Add getUblInvoice() method in Sales controller for UBL download - Modify getSendPdf() to optionally attach UBL based on invoice_format config - Add database migration for invoice_format configuration (pdf_only/ubl_only/both) - Add UBL download button to invoice view - Add UBL download link to sales manage table - Add language keys for UBL-related UI elements Data mapping: - Company name/address -> Supplier Party - account_number -> Company VAT number - Customer address/country -> Customer Party with ISO country code - Customer tax_id -> Customer VAT number - Cart items -> InvoiceLines - Taxes -> TaxCategory and TaxTotal - Totals -> LegalMonetaryTotal Features: - Generate valid UBL 2.1 XML invoices - Download UBL from invoice view and manage table - Email with PDF, UBL, or both based on configuration - Support for multiple customer countries with ISO code mapping - Graceful handling of missing optional customer fields