Send a consensus message to hedera through your API with the option of using webhooks for waiting synchronously for finality.
post
https://hedera-serverless-consensus.vercel.app
/api/consensus/message/
Create new consensus message
WARNING: if you have a WEBHOOK_URL set in your client it is recommended that you do not set the allow_synchronous_consensus to false due to the implications of the NodeJS event loop with AWS Lambda.