Unique identifier of an Akamai customer. To verify your customer ID, log in to Console and then, on the Manage Application page, check the value of the customer_id setting.

Unique identifier of a Webhooks v3 subscription. Use the List subscriptions operation to return the IDs of your subscriptions.

Unique identifier of a Webhooks v3 event. Note that you can only return events currently in the event store. Webhooks v3 automatically removes events from the event store after seven days. Use the List events operation to return the IDs of all the events in the event store.