OptionalmethodArgs: {OptionalmethodArgs: {A test notification is sent to ensure the correct configuration of the Destination. If the notification cannot be delivered, the Subscription will not be created. The payload of the test notification is of type ResourceCreated for the resourceTypeId subscription.
Checks if one or more Subscriptions exist for the provided query predicate. Returns a
200status if any Subscriptions match the query predicate, or a404status otherwise.