Over the past six months, I’ve been transitioning the fulfillment processes at my e-commerce business to a third-party logistics (3PL) vendor. I didn’t know anything about 3PLs before starting this process, so there were a lot of things I didn’t know to ask about. Here are the list of questions that I recommend e-commerce merchants ask a 3PL if they’re considering working with them for fulfillment. Customer profile Do you have other clients whose order volumes are similar to mine?