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1. A customer with an existing Betfair account visits vendorapp.com and wants to sign up for the vendor application.  
2. The customer wants to purchase a 12 month subscription to vendorapp, so they purchase this from vendorapp.com.
3. vendorapp.com then call the Account API-NG operation getApplicationSubscriptionToken, passing in their Application Key, a valid session token (to prove that they own that app key) and the length of the subscription required.
4. Betfair return to the vendor a Subscription Token of the form ABCD-EFGH-IJKL.
5. The subscription is then activated by calling activateApplicationSubscription token, passing in the subscription token and a valid session token for the customer (in the X-Authentication header).
6. The activateApplicationSubscription service should be used in conjunction with the interactive login method.  See sample code here
   PLEASE NOTE - the interactive login method should include your Application Key and will return a sessionToken with the error PENDING_AUTH prior to the customer activating their subscription via activateApplicationSubscription  Once activated, the customer will be able to make requests to API-NG using your Application Key.