verify() public static method

public static verify ( $challenge )
 /**
  * @expectedException Braintree\Exception\Configuration
  * @expectedExceptionMessage Braintree\Configuration::merchantId needs to be set (or accessToken needs to be passed to Braintree\Gateway)
  */
 public function testVerifyRaisesErrorWhenEnvironmentNotSet()
 {
     Braintree\Configuration::reset();
     Braintree\WebhookNotification::verify('20f9f8ed05f77439fe955c977e4c8a53');
 }