curl --request GET \
  --url https://api.vambe.me/api/public/email-campaign/metrics/{id} \
  --header 'x-api-key: <x-api-key>'

{
  "total_recipients": 123,
  "sent": 123,
  "failed": 123,
  "pending": 123,
  "delivered": 123,
  "opened": 123,
  "clicked": 123,
  "bounced": 123,
  "dropped": 123,
  "open_rate": 123,
  "click_rate": 123,
  "bounce_rate": 123
}