There are several reasons why a transaction can fail. Some of these reasons could be:
1. Your customer pays with a card that is not supported by Klearly.
2. There are problems with your customer's card or payment account such as; the customer has entered the wrong PIN, the customer has reached the daily spending limit, the customer does not have enough balance, the customer removed the card/phone too soon or the NFC chip is not working. If this problem persists, we recommend that the customer contact their bank.
3. The transaction may take too long. If a transaction is not completed within a certain time, the customer should try again.
4. You closed the app during the transaction. You can easily solve this problem by opening the app.