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If you wish to execute custom PHP code in your invoice template (ie. have barcode render script added to invoice) you can do so by adding smarty {php} tag to your invoice template source.

1. Ensure your smarty have PHP handling enabled: Integrating templates - tips and tricks

2. Go to Settings → Billing → Invoice customization and edit your current invoice template. Click on [HTML] button to edit source.

HostBill Docs > Invoicing: Adding code to invoice templates > 1.png

3. Add your php code within {php} {/php} smarty tags, as below:

 {php} echo "Invoice generated at: ".time(); {/php}