Encryption Service Organization. An ESO is an organization or individual that is not a Member or Processor of the STAR Network but that provides services to a Member that include: (i) loading software into a STAR Terminal or STAR Internet Device; (ii) loading or injecting Encryption Keys into PIN Pads, STAR Internet Devices, or Authentication Tokens; (iii) providing merchant help desk support which includes reprogramming of terminal software, programming of STAR Internet Merchant Web sites and/or Internet Payment Screens; or (iv) providing STAR Account Holder help desk support, including but not limited to assisting STAR Account Holders with their STAR Internet Devices. nveloping: A process whereby documents of the same type or purpose are grouped together, bound, and sent to the same destination into an electronic envelope. This is done by an electronic data interchange management software function.