first upload all files

Modules/Coupon/Resources/lang/en/messages.php

@@ -0,0 +1,11 @@
+<?php
+
+return [
+    'not_exists' => 'The coupon does not exist.',
+    'already_applied' => 'The coupon has been already applied.',
+    'invalid_coupon' => 'The coupon is not valid.',
+    'minimum_spend' => 'You need to spend at least :amount to apply this coupon.',
+    'maximum_spend' => 'You need to spend less than :amount to apply this coupon.',
+    'inapplicable' => 'This coupon is not applicable to your cart.',
+    'usage_limit_reached' => 'The coupon usage limit has been reached.',
+];