The message content payload
The registered message type identifier (e.g. 'RC:TxtMsg')
List of target user IDs for directed messages. Only these users will receive the message.
If true, suppress push notifications for this message
If true, this message will not update the channel's last message
If true, request read receipt for this message
Key-value metadata (expansion) to attach to the message
Push notification configuration for this message
Callback invoked before the message is sent, providing the local message instance
The file to upload
Callback invoked during upload with progress percentage (0-100)
Callback invoked when the upload completes successfully
Callback invoked when the upload fails
GIF message content
Parameters for sending a GIF message.