When i complete purchase using payapal in my application then am redirected into my application. after that i click back button on browser, again am reach the paypal page with return to merchant button. After that am try to refresh the page, then the checkout page is showing and i can complete the transaction again and reach back to my redirect URL with approved status, But in paypal they didn't deduct the amount. Because of approved status my application have duplicate entry for one paypal transaction. so how can i solve it? Why can i get approved status for the same transaction with same invoice number with multiple time?
