If you upgrade to version 1.3.x you have to check your configuration classes. The ConfigurationInterace changes and two functions has been added.
/**
* Gets the request factory callback if it is set
* This callback can be used to manipulate the request before its returned.
*
* @return \Closure
*/
public function getRequestFactory();/**
* Gets the responsetransformer factory callback if it is set
* This callback can be used to manipulate the request before its returned.
*
* @return \Closure
*/
public function getResponseTransformerFactory();