Promise resolving to an object w/ the subscriptionID of the newly created subscription. When successfully called, the subscriptions
object will also be updated by calling getSubscriptionDetails(subscriptionID)
with the newly created subscriptionID
{
"subscriptionID": 11 // newly created subscription ID.
}
See documentation for corresponding error codes:
https://redirector.arcpublishing.com/alc/docs/swagger/?url=./arc-products/arc-sales.json#/Subscription_Interaction/redeem