Here are the possible reasons why the payment was unsuccessful. 

1. There is an error with the expiry date for the payment method that you have set up. 

Please check the accuracy of the expiry date and edit it to the correct one.  

2. Your card issuer has declined your transaction. 

The card issuer decides if it wants to accept your transaction. Please contact your card issuer for assistance. 

3. The deal is sold out. 

Some of the deals are available in limited quantities and at the point of purchase, they are already sold out and you were unable to buy any more.