ConnectApi.ExtensionInput

An extension.

Property	Type	Description	Required or Optional	Available Version
`alternativeRepresentation`	`ConnectApi.AlternativeInput`	Alternative representation of the extension.	Required	40.0
`extensionId`	String	ID of the extension.	Required	40.0
`payload`	String	Payload associated with the extension.	Required	40.0
`payloadVersion`	String	Payload version that identifies the structure of the payload associated with the extension.	Optional	40.0

Apex Reference Guide