add cryptomus payment

library/Cryptomus/RequestBuilderException.php

@@ -0,0 +1,45 @@
+<?php
+namespace Library\Cryptomus;
+
+final class RequestBuilderException extends \Exception
+{
+    /**
+     * @var string
+     */
+    private $method;
+
+    /**
+     * @var array
+     */
+    private $errors;
+
+    /**
+     * @param string $message
+     * @param int $responseCode
+     * @param string $uri
+     * @param null|mixed $previous
+     */
+    public function __construct($message, $responseCode, $uri, $errors = [], $previous = null)
+    {
+        $this->method = $uri;
+        $this->errors = $errors;
+
+        parent::__construct($message, $responseCode, $previous);
+    }
+
+    /**
+     * @return string
+     */
+    public function getMethod()
+    {
+        return $this->method;
+    }
+
+    /**
+     * @return array
+     */
+    public function getErrors()
+    {
+        return $this->errors;
+    }
+}