I’ve referred lot of things for payment processing system to android app. It proviedes Paypal’s SDK as best to do. But, i’ve little confusion in there for below image –
What’s the difference between these two – Mobile Express Checkout Library & Mobile Payment Libraries. And, which one will i choose to do the payment processing for android app. Anyone please, explain with brief explanation please. Thanks in Advance.

I hope this will help you :
I got this information from here.