This detection rule flags users who scan a receipt with an unusually high total amount. Flagging large transactions for review is beneficial just as a best practice. Large transactions may indicate employee fraud (creating a large receipt, scanning it, and then voiding the transaction) or guests earning on large catering orders despite your company not typically allowing it.
The Threshold amount can be defined in the provided field under the rule. It can be found under the "Activity Detection Rules" in the "Settings" section on Platform. Please find the screenshot below. 
Disclaimer:
In an effort to supply information as quickly as possible, this article has been published prior to a formal technical review, and is subject to factual, grammatical, and various structural errors. Data may be incomplete, disordered, or incorrect.
This additional disclaimer will be removed upon formal review of this article. The standard Punchh Inc. KB Disclaimer still applies, and can be found at: https://support.punchh.com/hc/en-us/articles/360040100273-Punchh-Inc-Knowledge-Base-Disclaimer