LHDN e-Invoicing: WooCommerce Plugin Setup for Malaysia

The Inland Revenue Board of Malaysia (LHDN) has mandated e-invoicing via the MyInvois system. For e-commerce stores running WooCommerce, integrating this at the checkout level is critical for tax compliance.

1. API Authentication via MyInvois

Your WooCommerce system needs to communicate securely with LHDN's API. You must configure OAuth 2.0 authentication using the Client ID and Client Secret generated from your MyInvois portal.

In your custom integration or plugin configuration, ensure tokens are cached securely (e.g., using Redis) to avoid rate limits when generating invoices during high-traffic checkout events.

2. Buyer TIN Validation at Checkout

To issue a valid e-invoice for B2B transactions, you must capture and validate the buyer's Tax Identification Number (TIN). Modify your WooCommerce checkout fields to include a TIN input. Before the order is finalized, your backend should ping the LHDN Validate TIN endpoint:

// Example conceptual API call
$response = wp_remote_get( 'https://preprod-api.myinvois.hasil.gov.my/api/v1.0/tin/validate?tin=' . $buyer_tin );

If invalid, the checkout must prompt the user to correct the data.

3. Generating Compliant QR Codes on Receipts

Upon successful validation by LHDN, the API returns a unique identifier and a validation link. LHDN requires this link to be rendered as a QR code on the final PDF receipt or email sent to the customer. Use a PHP library like endroid/qr-code to generate this dynamically within WooCommerce's woocommerce_email_order_meta hook.

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