There are two types of triggers to choose from:
This type of trigger is used to give the custom application an ability to answer back to a trigger event sent by the trigger service. This integration is bi-directional – a response from the custom application is required for a trigger invocation to be considered complete and successful.
This type of trigger is used to notify the custom application of a particular occurrence of an event. This integration is not bi-directional – trigger invocation is successful the moment the trigger service notifies the external application, and it does not require a response from the custom application.