Need code to implement PayPal authentication

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Our client asked us to implement PayPal authentication in our project. We implemented forms and windows authentication. I am new to PayPal Authentication. I am not able to find steps to implement in google search.

One time log in, user need not log in again when payment through PayPal gateway. This is the advantage to implement this PayPal authentication.

I am trying to implement PayPal API signature with this I am able to go to PayPal login page but from there I am not able to redirect to main.aspx page.

Thanks in advance any help.

Posted 21-Nov-11 16:51pm

Prakash Gempala

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Muthu Nadar · Answer 1 · 2011-11-21T18:14:00

Solution 1

Paypal must have provided you a pdf which has all the details of integrating.

Posted 21-Nov-11 18:14pm

Muthu Nadar

m@dhu · Answer 2 · 2011-11-21T18:25:00

The user will review payment information, and if everything is OK, enter the login credentials. After this, PayPal will redirect him to the URL you specified with RETURNURL when you called SetExpressCheckout.
When your RETURNURL is hit, you need to invoke the GetExpressCheckoutDetails method and see the details of the actual transaction; verify that everything is in order.

Introduction to PayPal for C# - ASP.NET developers[^]