How to stop/block large transactions from going through

Go to the Settings section of the Kangaroo Business portal.
click on Security.
Click on Block transaction and enter the maximum amount in the currency field under Fraudulent Activities.
The email of the business is automatically included and the business will be notified whenever a transaction is blocked.
Click on Save to save the changes made.
Monitor the earning and redeeming of customers as well by enabling the Notify me when a customer earns rewards and redeems redemptions within a period of 24h under Fraudulent Activities.
Enter the amount of points and amount of redemption in the fields.
Select the time period to monitor from the drop down list. Either 24h or 1 week or 1 month.
Enter in the email address to receive the notifications sent.
Click on Save to finalize.

In order to avoid fraudulent transactions, block transactions that seem to be too large to always be on the safe side.