Update attribute values of recipients filtered by a target group

curl --request POST \
     --url https://api.campaign.episerver.net/rest/{clientId}/recipients/{recipientListId}/modify \
     --header 'accept: application/json' \
     --header 'content-type: application/x-www-form-urlencoded' \
     --data 'targetGroup=integer<int64>'

var myHeaders = new Headers();
myHeaders.append("accept", "application/json");
myHeaders.append("content-type", "application/x-www-form-urlencoded");

var urlencoded = new URLSearchParams();
urlencoded.append("targetGroup", "integer<int64>");

var requestOptions = {
   method: 'POST',
   headers: myHeaders,
   body: urlencoded,
   redirect: 'follow'
};

fetch("https://api.campaign.episerver.net/rest/{clientId}/recipients/{recipientListId}/modify", requestOptions)
   .then(response => response.text())
   .then(result => console.log(result))
   .catch(error => console.log('error', error));

require "uri"
require "net/http"

url = URI("https://api.campaign.episerver.net/rest/{clientId}/recipients/{recipientListId}/modify")

https = Net::HTTP.new(url.host, url.port)
https.use_ssl = true

request = Net::HTTP::Post.new(url)
request["accept"] = "application/json"
request["content-type"] = "application/x-www-form-urlencoded"
request.body = "targetGroup=integer%3Cint64%3E"

response = https.request(request)
puts response.read_body

import requests

url = "https://api.campaign.episerver.net/rest/{clientId}/recipients/{recipientListId}/modify"

payload = 'targetGroup=integer%3Cint64%3E'
headers = {
   'accept': 'application/json',
   'content-type': 'application/x-www-form-urlencoded'
}

response = requests.request("POST", url, headers=headers, data=payload)

print(response.text)

// The recipient's attributes were updated.
[
  {
    "id": "",
    "created": "",
    "modified": "",
    "optInMailId": "",
    "links": [
      {
        "uriBuilder": {},
        "rels": [
          ""
        ],
        "rel": "",
        "type": "",
        "params": "",
        "title": "",
        "uri": ""
      }
    ]
  }
]

// The target group is not provided or recipient's attribute is not recognized or its value cannot be parsed. Ensure that "target group" is added to the request and that the required parameters are correct.