Moodle customization + Paypal integration for fees payment

Moodle customization + Paypal integration for fees payment. Students shall able to pay and register to the desired courses. Each course chapters will have short quiz and after completion of the course students shall able to print the certificate of completion. Only Bid if: 1. You have min. 2 sites to show in Moodle latest version 2. Details of the customization done for sites mentioned 3. Average turnaround time for the customization required.