title: Credit card payment in Xamarin
body: <p>I am developing a mobile app using Xamarin. 
  My main target will be Android devices, but i want to be able to extend to IOS. 
  I want to set up a "marketplace", where you can buy currency, used to buy items in the app. The user should be able to pay with their credit card.</p>
  
  <p>Do any of you have experience with implementing credit-card payment in Xamarin?
  I have been looking at the paypal SDK, but i am not sure if it is the right one to go with, so if you have hands-on experience, i would appreciate your advice.</p>