The type of digital event to subscribe for. The event types available are:

• MESSAGES - A message sent either by customer or a contact center resource (agent, supervisor, system or bot)
• CUSTOMER_MESSAGES - A message sent by customer
• CC_MESSAGES - A message sent by a contact center resource (agent, supervisor, system or bot)
• PARTICIPANT_ADDED - A participant added to an engagement
• PARTICIPANT_DISCONNECTED - A participant disconnected an engagement
• ENGAGEMENT_CREATED - A new engagement was created
• ENGAGEMENT_ERROR - An error occurred in an engagement
• TYPING - An indication that a Contact Center participant is typing. This event is only supported for Custom Messaging
• ALL - An event belonging to any of the above types occurred. When you subscribe to ALL, you are effectively subscribing to all current event types, as well as any that might be introduced in the future. Therefore, it's crucial to ensure that your callback handler doesn't fail or return an error when receiving any new event type that you are not prepared to handle