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ATMIA ESO Registration Clearinghouse   Definition of ESO per the Plus System, Inc. By-Laws and Operating Regulations and the Interlink Network, Inc. By-Laws and Operating Regulations: An Encryption and Support Organization (ESO) is "any organization, which is not a Plus or Interlink Member, whose Plus/Interlink business relationship with a Plus or Interlink Member involves any of the following activities: loading software into an ATM or terminal that accepts cards loading or injecting encrypting keys into an ATM or a terminal/PIN pads providing help-desk support that includes re-programming of ATM/terminal software An ESO "must be registered with Visa before a Member may use their services." Comments: ESOs will need to submit certain due diligence information on an annual basis to refresh the data ESOs are responsible for absorbing all costs associated with due diligence. Sponsoring Financial Institutions are responsible for vetting all information obtained through the ATMIA website. Your Sponsoring Financial Institution will be responsible for: ESO Designation Agreement OFAC Check D&B Check Credit Check on Principal Owner(s) Agent Query (ARIS)