curl --request POST \
  --url https://api.sendrealm.com/imports/{import_id}/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-Sendrealm-Project-Id: <x-sendrealm-project-id>' \
  --data '{}'

const options = {
  method: 'POST',
  headers: {
    'X-Sendrealm-Project-Id': '<x-sendrealm-project-id>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({})
};

fetch('https://api.sendrealm.com/imports/{import_id}/preview', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.sendrealm.com/imports/{import_id}/preview"

payload = {}
headers = {
    "X-Sendrealm-Project-Id": "<x-sendrealm-project-id>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "status": 123,
  "data": {
    "import_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "prepared_action_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "operation": "imports.commit",
    "expires_at": "2023-11-07T05:31:56Z",
    "counts": [
      {
        "status": "<string>",
        "rows": 1
      }
    ],
    "sample": [
      {
        "row_number": 123,
        "status": "<string>",
        "error_code": "<string>",
        "result": {
          "action": "create",
          "identity": "<string>",
          "mapped": {},
          "resource_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
          "version": "<string>",
          "changes": [
            "contacts_created"
          ]
        }
      }
    ],
    "effects": {
      "import_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "valid_rows": 1,
      "invalid_rows": 1,
      "automation_effects": "suppress",
      "changes": {
        "contacts_created": 1,
        "contacts_updated": 1,
        "properties_created": 1,
        "audiences_created": 1,
        "memberships_created": 1,
        "memberships_updated": 1,
        "subscriptions_created": 1,
        "subscriptions_updated": 1
      }
    },
    "changes": {
      "contacts_created": 1,
      "contacts_updated": 1,
      "properties_created": 1,
      "audiences_created": 1,
      "memberships_created": 1,
      "memberships_updated": 1,
      "subscriptions_created": 1,
      "subscriptions_updated": 1
    }
  }
}