curl --request POST \
  --url https://api.example.com/cabinet/auth/account/link/{provider}/callback \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "code": "<string>",
  "state": "<string>",
  "device_id": "<string>"
}
'

{
  "success": true,
  "message": "<string>",
  "merge_required": false,
  "merge_token": "<string>"
}