I think you can start from this (but is deprecated) PayPal.Forms and braintree-integration-in-xamarin-forms-part-4 that it seems an alternative.
Otherwise you can use REST API payments
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I am new to Xamarin Forms, developing my very first project.
I would like to make an app with PayPal payment capability but I am unable to find documentantion on it.
I have found a demo with little explanation on how it works, but when I run it, it does nothing.
Would apreciate it much if anyone could supply me with some useful info.
I think you can start from this (but is deprecated) PayPal.Forms and braintree-integration-in-xamarin-forms-part-4 that it seems an alternative.
Otherwise you can use REST API payments