What is the syntax for constraint in Show Massage for CHANGE TOTAL

I want to show the pop up message ONLY when there is Change to be paid, what is the correct syntax?

I don’t seem to find a printer template formatting tag to change color of the message box. Am I looking at the right place for that function?

It would be the Printer Tag {CHANGE TOTAL}. But that value might not be available in your Rule. You should use a Show Message Action to display that Tag value in your Rule to confirm.

You might need to put your Show Message action in a Payment Processed Rule instead, in which case you could use [:ChangeAmount] as an action constraint like this:

[:ChangeAmount] > 0

You cannot change the color or formatting of the Message Box. You would need to use an Ask Question action instead.

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