An account ID is a unique identifier for your business in the Omega EDI system.  You can choose any account ID consisting of letters and number.  By default, the system will choose an account ID based off of your business's name but you can choose any account ID you like (as long as it hasn't already been taken).
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If you decide to choose your own account ID be sure to choose something that is easy to remember - all users in your organization will need to enter the account ID each time they log in.