The Omnichannel API automatically creates a compatible message for each channel based on the text content held in the body property, therefore removing the need to specify a custom message body for each channel. This makes sending simple text-based messages more straightforward.
You can specify a title property, which will be used to describe the message on channels that support the concept.
Watch out for length restricitions
Some channels might have a maximum message length restriction. If your message exceeds that, it will be truncated. Use a customBody to provide alternative content for these channels