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Yes - before providing any payments - you need to request W-9 form - http://www.irs.gov/pub/irs-pdf/fw9.pdf
or form W-8 - http://www.irs.gov/pub/irs-pdf/fw8.pdf for foreign persons
If the form is not provided - you might need to withhold income tax and remit to the IRS -
see Publication 515 for details
In additional you might need to file 1099misc - http://www.irs.gov/pub/irs-pdf/f1099msc.pdf - to report that you made direct sales of at least $5,000 of consumer products to a buyer
for resale anywhere other than a permanent retail establishment.
Let me know if any clarification is needed.