convert Curl with headers -H and -- data to RestClient

Timothy Fong <timfong888@...>
 

How do I convert the following to Restclient?

curl -H "Content-Type: application/json" -X POST --data '{"contacts" : [1111],"text" : "Testing"}' https://api.sendhub.com/v1/messages/?username=NUMBER\&api_key=APIKEY
 

Join main@rest-client.groups.io to automatically receive all group messages.