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To have the functionality of tracking affiliates, you should be able to create a form to input traffic and sales data into a form.
And once you would have the submission data you could use one of JotForm's Reports to display the data. Additional to that, you could also export the data to Excel to further expand the possibilities to work with the data.
so I need my custom solution to input data into your stats forms? There is
no built in affiliate solution in jotform?
Unfortunately Jotform doesn't have yet affiliate function but like what my colleague mention you can track your sales using a report you can also use the webhook feature to pass value from form to URL that you specify, If you have an affiliate and wants to track the stats using the affiliate tracking code you may refer to this thread for samples.