Amazon has approximately 3 million active sellers, and the number is expanding at a rate of over 3,000 new sellers per day. When it comes to fulfilling orders, each of those Amazon retailers must make a decision: pay Amazon to do it or manage the process themselves. As a merchant, Amazon can ship orders on your behalf via the Fulfillment by Amazon (FBA) program, or you can take complete control of shipping via the Fulfillment by Amazon (FBM) program.