handle delivery schedule dates

backend/app/plugins/wiaas/includes/class-wiaas-product.php

@@ -70,6 +70,10 @@ class Wiaas_Product {
 
 		return $args;
 	}
+
+	public static function get_supplier_id($product_id){
+		return get_field('supplier', $product_id) ?: NULL;
+	}
 }
 
 Wiaas_Product::init();