The contractor must have Internet connectivity and access to a web browser to submit sales reports electronically. The first step is to register with the GSA Vendor Support Center (VSC) at http://vsc.gsa.gov/. This web site provides information and instructions, including an online demo, regarding registration and electronic sales reporting. You may also contact the VSC by telephone at (877) 495-4849 or (703) 305-6235. Additional information on electronic payments can be found at http://72a.gsa.gov/. Following award, the appropriate ACO issues instructions to the contractor on utilizing these web sites.