No such thing (either SSN or Fed Tax ID) if they are US based or have a tax treaty with the US and if they offer a Paypal/Payoneer option). If you are getting paid electronically (Paypal, wire, Payoneer) and you don't disclose that income you put yourself at risk. Paypal certainly reports and sends a 1099 on $20K and higher. So the parking company question doesn't even apply. It's the payment processor you need to be concerned about. Solution - do less than $20K a year on Paypal and take a chance not disclosing the income since you won't get a 1099.