Day 2: Generate UBL XML Structure for IRB e-Invoice #ubl #xmlbuilder

SEO Title: Day 2: Generate UBL XML Structure for IRB e-Invoice #ubl #xmlbuilder
Focus Keyphrase: IRB e-invoice integration
Meta Description: Generate UBL 2.1-compliant XML invoices for IRB e-invoice integration in Laravel. Learn to construct a proper XML structure with required namespaces and tags.

Table of Contents

Creating a UBL 2.1-Compliant XML Invoice

IRB requires all submitted e-Invoices to follow the UBL 2.1 standard. That means your XML must follow strict schema rules, use the correct namespaces, and follow element ordering. Let’s generate a basic but valid <Invoice> XML using Laravel and DOMDocument.

Step 1: Create the XML Generator Class

Create app/Services/IRB/IRBInvoiceXmlGenerator.php:


namespace App\Services\IRB;

use DOMDocument;

class IRBInvoiceXmlGenerator
{
    public function generate(array $invoiceData): string
    {
        $doc = new DOMDocument('1.0', 'UTF-8');
        $doc->preserveWhiteSpace = false;
        $doc->formatOutput = true;

        // Create root element
        $invoice = $doc->createElementNS(
            'urn:oasis:names:specification:ubl:schema:xsd:Invoice-2',
            'Invoice'
        );

        // Add namespaces
        $invoice->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:cac',
            'urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2');
        $invoice->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:cbc',
            'urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2');

        $doc->appendChild($invoice);

        // Add basic elements
        $cbc = 'urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2';

        $invoice->appendChild($doc->createElementNS($cbc, 'cbc:ID', 'INV-1001'));
        $invoice->appendChild($doc->createElementNS($cbc, 'cbc:IssueDate', date('Y-m-d')));
        $invoice->appendChild($doc->createElementNS($cbc, 'cbc:InvoiceTypeCode', '01')); // 01 = Invoice

        return $doc->saveXML();
    }
}

Step 2: Create a Test Route in Laravel

In routes/web.php:


use App\Services\IRB\IRBInvoiceXmlGenerator;

Route::get('/irb/xml-preview', function () {
    $xml = app(IRBInvoiceXmlGenerator::class)->generate([]);
    return response($xml, 200)->header('Content-Type', 'application/xml');
});

Now visit http://localhost:8000/irb/xml-preview and you’ll see your first valid UBL 2.1 skeleton invoice.

Step 3: Add Buyer & Supplier Details

Tomorrow we’ll expand this by adding full company data, tax category codes, address info, and invoice lines using cac:AccountingSupplierParty, cac:AccountingCustomerParty, and cac:InvoiceLine.

UBL Resources for Reference

Coming Up in Day 3

We’ll continue the UBL generation by adding supplier and buyer identities, tax categories, and address components — exactly as IRBM requires for MyInvois compliance.

Tags: #IRBIntegration #UBL21 #Laravel #EInvoiceXML #MyInvois

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