curl --request POST \
  --url https://api.voice-agents.miraiminds.co/v2/call/initiate \
  --header 'Content-Type: application/json' \
  --header 'workspace: <workspace>' \
  --header 'x-private-key: <api-key>' \
  --header 'x-public-key: <api-key>' \
  --data '
{
  "phoneNumber": "+919876543210",
  "assistant": "assistant_123"
}
'