Backward compatibility added

includes/Order/Hooks.php

@@ -329,7 +329,7 @@
         $available_vendors = array_unique( $available_vendors );
 
         if ( $coupon->is_type( 'fixed_cart' ) && count( $available_vendors ) > 1 ) {
             throw new Exception( __( 'This coupon is invalid for multiple vendors.', 'dokan-lite' ) );
         }
 
         // Make sure applied coupon created by admin
@@ -341,9 +341,9 @@
             return $valid;
         }
 
-        // A coupon must be bound with a product
+        // A coupon must be bound with a product if pro is deactivated
         if ( ! dokan()->is_pro_exists() && count( $coupon->get_product_ids() ) === 0 ) {
             throw new Exception( __( 'A coupon must be restricted with a vendor product.', 'dokan-lite' ) );
         }
 
         $coupon_id = $coupon->get_id();