* Implement external download option for supplier invoices
Added a new option to allow external downloads for supplier invoices, enhancing user flexibility.
* Add option for external download in supplier order
* Enable external download for supplier orders and invoices
Added conditions to enable external download for supplier orders and invoices based on configuration settings.
* Add direct download URLs for supplier orders and invoices
* Update copyright information in supplier_invoice.php
Added copyright notice for Pierre Ardoin for 2026.
* Update supplier_order.php
* Cast thirdparty ID to integer in fetch call
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Co-authored-by: Laurent Destailleur <eldy@destailleur.fr>
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