*__DIRECTDOWNLOAD_URL_PROPOSAL__ -> Direct download url of a proposal
*__DIRECTDOWNLOAD_URL_PROPOSAL__ -> Direct download url of a proposal
*__DIRECTDOWNLOAD_URL_ORDER__ -> Direct download url of an order
*__DIRECTDOWNLOAD_URL_ORDER__ -> Direct download url of an order
−
*__DIRECTDOWNLOAD_URL_INVOICE__ -> Direct download url of an invoice
+
*__DIRECTDOWNLOAD_URL_INVOICE__ -> Direct download url of an invoice. This needs that the setup INVOICE_ALLOW_EXTERNAL_DOWNLOAD is set to allow to generate the link.