Transaction Limit
As a merchant, you can establish a limit on a customer's account using the transaction limit APIs. This means that on a customer's account, you can specify the maximum amount per transaction, the maximum number of transactions per day, and the total amount per day. To do so, you will need to build a Limit Profile and use the Limit Profile code to assign customers to the limit profile.
Here is the documentation on creating and managing Transaction Limit via APIs: