First commit

packages/mmt/ddd-shared-kernel/ValueObjects/FixedCommission.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace MMT\DDDSharedKernel\ValueObjects;
+
+use MMT\DDDSharedKernel\Interfaces\Commission;
+
+class FixedCommission extends Commission
+{
+    public function __construct(
+        public private(set) Money $value
+    )
+    {
+        if($value->isNegative()) {
+            throw new \InvalidArgumentException('The amount of a commission cannot be negative');
+        }
+    }
+
+    public function applyTo(?Money $money = null): Money
+    {
+        return $this->value;
+    }
+}