from it's terms and conditions: "For non-U.S. taxpayers, this information includes without limitation either a signed certification that the taxpayer does not have U.S. activities or a fully-completed Form W-8 or other form, which may require a valid U.S. tax identification number," How am I to get a valid U.S tax identification number, if I'm not in the U.S? What does it mean by the first option?
I'm not in the US and I just ignored the SSN box. I still get paid okay. If you're not in the US you can't get a valid US tax ID number.