PayPal Integration for Customer Registrations

I need a skilled developer to integrate PayPal into my existing registration website. This task involves the following elements:

- Accepting payments from customers on the website.
- Report whether a payment was successfully completed by PayPal before proceeding with registration.
- Direct API integration with PayPal is preferred.

The site is built using ASP.NET Web Forms with C#, so experience in this language would be helpful. The developer of the site is available to work with. Familiarity with PayPal operations would also be beneficial in the execution of this project. This job requires both backend and frontend skills. Successful completion will streamline the registration process and enhance user-experience on the site.