curl https://api.v2.dealmachine.com/v1/mail/campaigns/a1b2c3d4/analytics \
  -H "Authorization: Bearer dm_sk_live_xxx"

{
  "data": {
    "campaign_id": "a1b2c3d4",
    "campaign_name": "Spring Seller Campaign",
    "total_recipients": 150,
    "total_sent": 150,
    "total_delivered": 142,
    "total_bounced": 8,
    "total_responses": 12,
    "delivery_rate": 94.67,
    "response_rate": 8.45
  }
}