curl --request POST \
  --url https://api.migma.ai/v1/subscribers/bulk \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "subscribers": [
    {
      "email": "[email protected]",
      "projectId": "<string>",
      "firstName": "<string>",
      "lastName": "<string>",
      "country": "<string>",
      "language": "<string>",
      "tags": [
        "<string>"
      ],
      "customFields": {}
    }
  ],
  "projectId": "<string>"
}
'

{
  "success": true,
  "data": {
    "success": 123,
    "failed": 123,
    "updated": 123,
    "errors": [
      "<string>"
    ]
  },
  "error": "<string>"
}