| Interface | Description | 
|---|---|
| ExternalConversationSystemAdapter | Interface that needs to be implemented by an external conversation system provider. | 
| ExternalMessageBuilder | Builder that can be used for sending external messages | 
| ExternalSystemContentService | Service that is responsible for fetching content from the external systems. | 
| ExternalSystemIds | This interface contains some available external system ids. | 
| InboundErrorHandler | Handler for inbound errors from an external adapter. | 
| InboundMessage | |
| InboundMessageBuilder | Builder for sending inbound messages (messages from external adapters) to the engage platform. | 
| InboundMessageHandler | Message handler for inbound messages (messages from external adapters). | 
| InboundService | Service responsible for providing the handlers for the different inbound handlers
 for different external adapters. | 
| InboundStatusHandler | Handler for inbound statuses from the external adapters | 
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