Invoice optional

Hi @stijndemulder,

This is certainly possible using a checkout custom field. You could use a plugin like Checkout Field Editor, for instance, to add your checkbox/radio custom field to the billing fields. Let’s say that you named your field billing_want_invoice and the value when checked is yes, then you could add a code snippet like this to enable the invoice only if the customer checked the field:

/**
 * Enable invoice if customer wants it
 */
add_filter( 'wpo_wcpdf_document_is_allowed', 'wpo_wcpdf_allow_invoice_or_proforma_based_on_customer_selection', 10, 2 );
function wpo_wcpdf_allow_invoice_or_proforma_based_on_customer_selection( $allowed, $document ) {
	if ( $order = $document->order ) {
		if ( $want_invoice = $order->get_meta( 'billing_want_invoice' ) ) {
			if( $document->type == 'invoice') {
				$allowed = ($want_invoice == 'yes') ? true : false;
			}
		}
	}
	return $allowed;
}

Let me know if you manage to make it work ??