Assigning a Subscription Code {#recur-bill-assign-sub-code}
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When you create a subscription, you can supply a subscription code that relates to your business and that is used for reference to the subscription. This code can be numeric or alphanumeric with dash (-) and dot (.) characters and can be up to 10 characters long.  
If you do not supply a subscription code, the recurring billing system automatically assigns a code.