fixed

front/vendor/alibabacloud/credentials/src/CredentialsInterface.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace AlibabaCloud\Credentials;
+
+use AlibabaCloud\Credentials\Signature\SignatureInterface;
+
+/**
+ * Interface CredentialsInterface
+ *
+ * @codeCoverageIgnore
+ */
+interface CredentialsInterface
+{
+    /**
+     * @return string
+     */
+    public function __toString();
+
+    /**
+     * @return SignatureInterface
+     */
+    public function getSignature();
+}