curl --request POST \
  --url https://my.cald.ai/client/api/v1/agents/{agentId}/call \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "phoneNumber": "<string>",
  "prospectName": "<string>",
  "email": "<string>",
  "yourCustomVariable": "<string>"
}'

{
  "status": "<string>",
  "callId": "<string>"
}