Cart and Paypal integration

I am beginner in CodeIgniter. I think CodeIgniter is the best framework in the world. I think of these features are available in codeigniter , it will be great.

1. payment integration(paypal) library
   
2. cart library
   

When making an e-commerch site it must be to add this system in site.
So if codeigniter provides this fetures internally . It will be very helpful for developer. It also create attract to the developer to use codeigniter.
please add payment integration(paypal) library that a developer can integrate just write one or two code.
please add this feature soon.