How to send meesage to slack channel

curl -X POST 

-H 'Content-type: application/json' 

--data '{"text":"Allow me to reintroduce myself!"}' YOUR_WEBHOOK_URL

curl -X POST 

-H 

--slient

--data-urlencode 

   "payload={\"text\": \" Hello $(sudo -u username /home/hello/tryme.sh)\"}"

YOUR_WEBHOOK_URL