Does anyone know the correct IRS business activity code to use for a small business that makes money by marketing online (all pay per click search) for internet retailers and gets paid a commission for each referral that leads to a sale? (no inventory – just advertising and commissions based on sales referrals. All done online.)
Thanks!

can anybody guide me how affiliate marketing works? If suppose I put some affiliate links on my website, how would I know if a person has clicked my referral links. Is there some way to know this? Can a company cheat with its affiliate marketing program by not giving payment? How will I keep a track on the no. of visitors following my referral links? I hope you getting my point.

Also please let me know how can i earn money through ebay?

Thanks