Asp.Net PayPal Control

Capture PayPal Instant Payment Notification (IPN) and have the component verify the message with PayPal before your code updates orders, memberships, or fulfillment. Instead of stitching together raw form posts and edge cases, you get server-side events (like IPN_Notified) with strongly-typed data so the "paid but not activated" scenario is easier to prevent.

Handle the synchronous PayPal return (PDT/return) using a dedicated PayPal Return Handler or same-page event (PayPal_Returned) so your app can display the right confirmation and capture return variables consistently. This reduces the common confusion around return URL behavior and missing fields by centralizing the post-checkout return flow.

Extend PayPal form posts with AdditionalFormVariables when you need fields not exposed as first-class properties (for example solution_type or landing_page). This keeps your integration flexible as PayPal options change, without forcing you to fork the component or hardcode form fields throughout your app.