Xamarin ios and android payment gateway in browser - xamarin

I am using Xamarin for mobile development.
I have a requirement to integrate a payment gateway with the app. Chosen payment gateway has a web interface only.
Is there a way i can use this payment gateway, like opening up a webclient and then using web view to make transactions and then provide a redirect url of the app so that success/failed transactions can be redirected to the app and then i can show data that has been bought ?

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How to integrate 3D secure on Xamarin.Forms with Stripe?

I had integrated a payment method with stripe on a Xamarin.Forms application that works only for payments that don't require 3D secure.
Today I'm looking to integrate the 3D secure part on my Xamarin.Forms application but the Stripe documentation does not provide any information for Xamarin.Forms.
For the moment my application create a TokenService before payment and then a ChargeService to make a payment.

Is it possible to integrate braintree with .net desktop application?

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The "desktop" client .NET application should use the JS SDK. Theoretically the client could implement HTTPS calls in native .NET with no JS SDK, but it will be far simpler and more robust to use the JS SDK provided by Braintree in your .NET application.

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I have an application. I have created a facebook page for it . Now when I look at the Facebook API , It asks me this
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App on Facebook (Use my app inside Facebook.com.),
Mobile Web (Bookmark my web app on Facebook mobile.),
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Native Android App ( Publish from my Android app to Facebook.),
Page Tab (Build a custom tab for Facebook Pages.),
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Kindly help me in all these circumstances with the perfect code as I am novoice to OAuth
Take a look on official Facebook C# SDK Sample for Windows Phone 7
https://github.com/facebook-csharp-sdk/facebook-windows-phone-sample

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