curl --request GET \
  --url https://api.sendrealm.com/push/campaigns/{id}/audience-preview \
  --header 'Authorization: Bearer <token>'

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.sendrealm.com/push/campaigns/{id}/audience-preview', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.sendrealm.com/push/campaigns/{id}/audience-preview"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.text)

{
  "status": 123,
  "data": {
    "reachable_devices": 123,
    "by_platform": [
      {
        "platform": "<string>",
        "devices": 123
      }
    ],
    "note": "<string>"
  }
}

{
  "status": 123,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": "<string>",
    "issues": [
      {
        "code": "<string>",
        "path": "<string>",
        "message": "<string>"
      }
    ]
  }
}