curl --request POST \
  --url https://api-message.nativehub.live/api/v1/contacts/import \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file'

{
  "imported": 985,
  "skipped": 12,
  "errors": 3
}