curl --request POST \
  --url https://inboxapp.com/api/v1/campaigns/v2/{campaignId}/leads \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "platform": "twitter",
  "platformIds": [
    "<string>"
  ],
  "usernames": [
    "<string>"
  ],
  "externalIds": [
    "<string>"
  ],
  "leads": [
    {
      "platformId": "<string>",
      "username": "<string>",
      "externalId": "<string>",
      "platform": "twitter",
      "data": {}
    }
  ]
}
'

{
  "added": 4503599627370495,
  "skipped": 4503599627370495,
  "failed": 4503599627370495
}