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There are many different events that can be subscribed to that deal with different billing lifecyle lifecycle events such as account creating, bill run execution and many more. Click here for the full list of events.
Parameters
Parameters are name value pairs that provide additional information about the event. Parameters are contextual and dependent on the underlying event object. For example, on a service state transition notification it is possible to provide the corresponding service name as a token. However on a bill run it is not possible to provide a service name as there are multiple accounts and services that can be associated with a bill run.
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