Only Send Invoice for Only One Product

Hi! The hook is quite simple in that it takes two arguments: 1) a boolean whether the document is allowed and 2) the document object (which contains the order in the order property: $document->order):

Here’s an example:

add_filter('wpo_wcpdf_document_is_allowed','wpo_wcpdf_invoice_specific_product',10,2);
function wpo_wcpdf_invoice_specific_product( $is_allowed, $document ) {
	if ( !empty($document->order) && $document->get_type() == 'invoice' ) {
		$allowed_product = 42; // this is the product ID of the product you want to invoice (use parent ID for variable products)
		foreach ( $document->order->get_items() as $item_id => $item ) {
			if ( $item->get_product_id() != $allowed_product ) {
				$is_allowed = false; // there's a product in the order that is not the allowed product
			}
		}
	}
	return $is_allowed;
}

Awesome! Thanks for the help. Looks like it’s working.

Is there a quick way to change the filename that comes through to the email?

https://docs.wpovernight.com/woocommerce-pdf-invoices-packing-slips/custom-pdf-filenames/

Perfect. Thank you!