Stick to the interface.

andris-sevcenko · andris-sevcenko · commit 4b6dbd3ad463 · 2018-02-23T09:47:31.000Z
diff --git a/src/base/Gateway.php b/src/base/Gateway.php
@@ -363,7 +363,7 @@ public function purchase(Transaction $transaction, BasePaymentForm $form): Reque
     /**
      * @inheritdoc
      */
-    public function refund(Transaction $transaction, float $amount): RequestResponseInterface
+    public function refund(Transaction $transaction): RequestResponseInterface
     {
         if (!$this->supportsRefund()) {
             throw new NotSupportedException(Craft::t('commerce', 'Refunding is not supported by this gateway'));

Original file line number	Diff line number	Diff line change
`@@ -363,7 +363,7 @@ public function purchase(Transaction $transaction, BasePaymentForm $form): Reque`
`363`	`363`	`/**`
`364`	`364`	`* @inheritdoc`
`365`	`365`	`*/`
`366`		`- public function refund(Transaction $transaction, float $amount): RequestResponseInterface`
	`366`	`+ public function refund(Transaction $transaction): RequestResponseInterface`
`367`	`367`	`{`
`368`	`368`	`if (!$this->supportsRefund()) {`
`369`	`369`	`throw new NotSupportedException(Craft::t('commerce', 'Refunding is not supported by this gateway'));`