I wanted to clarify when the $600 rule applies.  An example would be if you operated a gold-4-bitcoin shop and used BitPay as your payment processor.  

If you only sold $400 of gold via BitPay that year, nothing would happen. However, if you sold $100,000 of gold via BitPay that year, BitPay would be required to report this amount.  In no case does BitPay care who your customers are, they just need to keep track of the total funds they transfer to you.  Your customers are your business, not BitPay's.  

These are the same reporting requirements as for PayPal or Visa.