curl --request POST \
  --url https://www.carstoragesoftware.com/api/v1/marketing/campaigns/{id}/audience \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "customerIds": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ]
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({customerIds: ['3c90c3cc-0d44-4b50-8888-8dd25736052a']})
};

fetch('https://www.carstoragesoftware.com/api/v1/marketing/campaigns/{id}/audience', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://www.carstoragesoftware.com/api/v1/marketing/campaigns/{id}/audience"

payload = { "customerIds": ["3c90c3cc-0d44-4b50-8888-8dd25736052a"] }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "data": {
    "added": 123,
    "removed": 123,
    "audience": [
      {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "campaignId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "customerId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "status": "<string>",
        "currentStepOrder": 123,
        "nextStepAt": "2023-11-07T05:31:56Z",
        "joinedAt": "2023-11-07T05:31:56Z",
        "completedAt": "2023-11-07T05:31:56Z",
        "unsubscribedAt": "2023-11-07T05:31:56Z"
      }
    ]
  }
}

{
  "error": "<string>",
  "code": "<string>",
  "details": null
}

{
  "error": "<string>",
  "code": "<string>",
  "details": null
}

{
  "error": "<string>",
  "code": "<string>",
  "details": null
}

{
  "error": "<string>",
  "code": "<string>",
  "details": null
}