curl --request POST \
  --url https://example.com/api/v1/project/{projectSlug}/{env}/outbound-calls/{outboundCallId}/terminate \
  --header 'x-api-key: <api-key>'

{
  "success": true,
  "data": {
    "outboundCallId": "oc_01a0a4af5a417f5186af",
    "phase": "terminal",
    "outcome": "canceled"
  }
}

{
  "success": false,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>"
  }
}

{
  "success": false,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>"
  }
}

{
  "success": false,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>"
  }
}