do_action( 'learndash_purchase_invoice_thumbnail_before', string $img_file, array $purchase_invoice_args, TCPDF $pdf )
Fires before the thumbnail image is added to the PDF.
do_action( 'learndash_purchase_invoice_thumbnail_before', string $img_file, array $purchase_invoice_args, TCPDF $pdf )
Fires before the thumbnail image is added to the PDF.