Does the PayPal .NET SDK 1.7.2 (https://www.nuget.org/packages/PayPal/) support Express Checkout? I can't seem to find it in the sample code.
If not, does it provide another mechanism to take payment on an ecommerce site?
Or should I be using the PayPal Merchant SDK for .NET 2.16.117 (https://www.nuget.org/packages/PayPalMerchantSDK/)
There was a note on github about the merchant SDK being deprecated due to the TLS/SSL changes coming down the pipe.
Yes, the REST Api
(your first link) calls it Paypal Payment
- you'll recognize the flow maps to the "classic" Express Checkout (but obviously with a new implementation). Hth...