Cpalead is the best among all cpa company . its easy to use and easy to create a widget code. Below i make a video how to create a widget code on cpalead .
http://www.youtube.com/watch?v=J5y_-D9ujNo&feature=youtu.be
http://www.youtube.com/watch?v=J5y_-D9ujNo&feature=youtu.be