The PayPal Sandbox is PayPal's test environment that lets you test your Instant Payment Notification script. You'll need to set up a PayPal developer account before you can create test accounts. Once you have an account setup you can create two test accounts, a personal account and a business account which allows you to replicate the purchaser and seller scenario.
Below is an example of an Instant PayMent Notification (IPN) script that has been setup to work with PayPal's Sandbox. The only difference with the standard PayPal IPN script is that the script below posts back to the Sandbox rather than standard URL.
Check out our page for a more detailed explanation of how PayPal Instant Payment Notification (IPN) works.
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Plug and play ASP membership script that integrates with PayPal to let you charge recurring membership fees.