If a business has Minumum checkin amount entered under the business settings which is equal to or more than $0.01, and the business is registering the checkin as Approved loyalty, then the settings need to be checked under the business settings for which you need to contact CSM or Punchh admin by raising a request on Support@punchh.com.
Below is the example of a $0 checkin which was approved due to the settings "Validate minimum receipt amount?" unchecked.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)