PHP - Paypal - Auto Redirect

It doesn't make sense to require users to have to empty their carts after completing an order. Instead, it should be emptied automatically once the purchase is complete.

If I recall correctly, PayPal lets you specify a URL to redirect to upon the completion of a transaction. One strategy would be to send the user to a "thank you" page that includes a unique identifier for the transaction in the query string. This would allow you to run cleanup for that user's cart before displaying the page.

You can't go sidestepping PayPal's system or policies, so you'll have to explore other options:

1. Empty the cart before sending them to PayPal;
2. Set up a cron job to empty carts on a regular interval;
3. Choose a service other than PayPal.