Missing Purchase Value in Event Tracking

Hello, I’d like to report an issue I’ve encountered with the event tracking on my Facebook ads account. It appears that my Purchase events are missing the ‘value’ parameter.

The specific error message I received is as follows: “The Purchase value parameter is missing. One or more of your Purchase events are without a value parameter. This may affect your ability to see the ROI calculations for advertising.” Here is a screenshot: https://ibb.co/0nJcyHY

Could you please guide me on how to add the missing value parameter to my Purchase events or provide a solution to ensure accurate tracking?

Best regards