Positive Pay file source

Summary: We're trying to locate the source of the amount value in our positive pay file. The data field just has PaymentAmount/Value. Can anyone advise where this value comes from in terms of SQL?

Content (please ensure you mask any confidential information): Payment files

Version (include the version you are using, if applicable): 24B

Code Snippet (add any code snippets that support your topic, if applicable): PaymentAmount/Value