post https://api.revolv3.com/api/Subscriptions/pan-lookup
Get all subscriptions that has the given payment account number as one of its payment methods.
Upon success, this operation returns a status of 200 (OK) and a list of subscription objects.
If an invalid field or value is submitted, a status of 400 (Bad Request) will be returned.
If the payment account number is not within the payment methods of any subscription, a status code of 404 will be returned.