curl --request POST \
  --url https://nxt-ulm-pdt.m1amdocs.io/platform/rest/v85/group/{groupId}/addUser \
  --header 'Content-Type: application/json' \
  --cookie JSESSIONID= \
  --data '
{
  "user": {
    "id": 1,
    "displayName": "Entity display name",
    "pin": "1111",
    "avatarUrl": "http://myavatar/johnsmith",
    "attributes": {
      "com.uxpsystems.mint.user.FamilyName": "<string>",
      "com.uxpsystems.mint.user.GivenName": "<string>",
      "com.uxpsystems.mint.user.Language": "fr_CA, en",
      "domain": "<string>",
      "preferredNotificationChannel": "<string>",
      "branding": "<string>"
    }
  },
  "entityPermissions": [
    {
      "entityId": 1
    }
  ]
}
'

import requests

url = "https://nxt-ulm-pdt.m1amdocs.io/platform/rest/v85/group/{groupId}/addUser"

payload = {
    "user": {
        "id": 1,
        "displayName": "Entity display name",
        "pin": "1111",
        "avatarUrl": "http://myavatar/johnsmith",
        "attributes": {
            "com.uxpsystems.mint.user.FamilyName": "<string>",
            "com.uxpsystems.mint.user.GivenName": "<string>",
            "com.uxpsystems.mint.user.Language": "fr_CA, en",
            "domain": "<string>",
            "preferredNotificationChannel": "<string>",
            "branding": "<string>"
        }
    },
    "entityPermissions": [{ "entityId": 1 }]
}
headers = {
    "cookie": "JSESSIONID=",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {cookie: 'JSESSIONID=', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    user: {
      id: 1,
      displayName: 'Entity display name',
      pin: '1111',
      avatarUrl: 'http://myavatar/johnsmith',
      attributes: {
        'com.uxpsystems.mint.user.FamilyName': '<string>',
        'com.uxpsystems.mint.user.GivenName': '<string>',
        'com.uxpsystems.mint.user.Language': 'fr_CA, en',
        domain: '<string>',
        preferredNotificationChannel: '<string>',
        branding: '<string>'
      }
    },
    entityPermissions: [{entityId: 1}]
  })
};

fetch('https://nxt-ulm-pdt.m1amdocs.io/platform/rest/v85/group/{groupId}/addUser', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://nxt-ulm-pdt.m1amdocs.io/platform/rest/v85/group/{groupId}/addUser",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'user' => [
        'id' => 1,
        'displayName' => 'Entity display name',
        'pin' => '1111',
        'avatarUrl' => 'http://myavatar/johnsmith',
        'attributes' => [
                'com.uxpsystems.mint.user.FamilyName' => '<string>',
                'com.uxpsystems.mint.user.GivenName' => '<string>',
                'com.uxpsystems.mint.user.Language' => 'fr_CA, en',
                'domain' => '<string>',
                'preferredNotificationChannel' => '<string>',
                'branding' => '<string>'
        ]
    ],
    'entityPermissions' => [
        [
                'entityId' => 1
        ]
    ]
  ]),
  CURLOPT_COOKIE => "JSESSIONID=",
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://nxt-ulm-pdt.m1amdocs.io/platform/rest/v85/group/{groupId}/addUser"

	payload := strings.NewReader("{\n  \"user\": {\n    \"id\": 1,\n    \"displayName\": \"Entity display name\",\n    \"pin\": \"1111\",\n    \"avatarUrl\": \"http://myavatar/johnsmith\",\n    \"attributes\": {\n      \"com.uxpsystems.mint.user.FamilyName\": \"<string>\",\n      \"com.uxpsystems.mint.user.GivenName\": \"<string>\",\n      \"com.uxpsystems.mint.user.Language\": \"fr_CA, en\",\n      \"domain\": \"<string>\",\n      \"preferredNotificationChannel\": \"<string>\",\n      \"branding\": \"<string>\"\n    }\n  },\n  \"entityPermissions\": [\n    {\n      \"entityId\": 1\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("cookie", "JSESSIONID=")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://nxt-ulm-pdt.m1amdocs.io/platform/rest/v85/group/{groupId}/addUser")
  .header("cookie", "JSESSIONID=")
  .header("Content-Type", "application/json")
  .body("{\n  \"user\": {\n    \"id\": 1,\n    \"displayName\": \"Entity display name\",\n    \"pin\": \"1111\",\n    \"avatarUrl\": \"http://myavatar/johnsmith\",\n    \"attributes\": {\n      \"com.uxpsystems.mint.user.FamilyName\": \"<string>\",\n      \"com.uxpsystems.mint.user.GivenName\": \"<string>\",\n      \"com.uxpsystems.mint.user.Language\": \"fr_CA, en\",\n      \"domain\": \"<string>\",\n      \"preferredNotificationChannel\": \"<string>\",\n      \"branding\": \"<string>\"\n    }\n  },\n  \"entityPermissions\": [\n    {\n      \"entityId\": 1\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://nxt-ulm-pdt.m1amdocs.io/platform/rest/v85/group/{groupId}/addUser")

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

request = Net::HTTP::Post.new(url)
request["cookie"] = 'JSESSIONID='
request["Content-Type"] = 'application/json'
request.body = "{\n  \"user\": {\n    \"id\": 1,\n    \"displayName\": \"Entity display name\",\n    \"pin\": \"1111\",\n    \"avatarUrl\": \"http://myavatar/johnsmith\",\n    \"attributes\": {\n      \"com.uxpsystems.mint.user.FamilyName\": \"<string>\",\n      \"com.uxpsystems.mint.user.GivenName\": \"<string>\",\n      \"com.uxpsystems.mint.user.Language\": \"fr_CA, en\",\n      \"domain\": \"<string>\",\n      \"preferredNotificationChannel\": \"<string>\",\n      \"branding\": \"<string>\"\n    }\n  },\n  \"entityPermissions\": [\n    {\n      \"entityId\": 1\n    }\n  ]\n}"

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

{
  "user": {
    "id": 1,
    "displayName": "Entity display name",
    "avatarUrl": "http://myavatar/johnsmith",
    "type": "user.SoftProfile",
    "credentialSet": true,
    "pinSet": false,
    "attributes": {
      "com.uxpsystems.mint.user.FamilyName": "<string>",
      "com.uxpsystems.mint.user.GivenName": "<string>",
      "com.uxpsystems.mint.user.Language": "fr_CA, en",
      "domain": "<string>",
      "preferredNotificationChannel": "<string>",
      "branding": "<string>",
      "secret2FATotp": "<string>",
      "aliases": [
        {
          "id": "<string>",
          "alias": "<string>"
        }
      ],
      "mobiles": [
        {
          "id": "<string>",
          "number": "<string>",
          "mfaoption": true
        }
      ],
      "emails": [
        {
          "id": "<string>",
          "email": "<string>",
          "mfaoption": true
        }
      ],
      "socialConnections": [
        {
          "id": "<string>",
          "providerId": "facebook, google",
          "socialId": true
        }
      ]
    }
  },
  "groupPermission": "admin",
  "entityPermissions": [
    {
      "entityClass": "account",
      "entityId": 1,
      "permission": "admin"
    }
  ]
}

{
  "fieldErrors": [
    {
      "field": "<string>",
      "code": "<string>",
      "code_v2": "invalid-input-error",
      "message": "<string>",
      "rejectedValue": "<string>"
    }
  ],
  "operationErrors": [
    {
      "code": "group-not-found",
      "message": "<string>"
    }
  ]
}

{
  "operationError": {
    "code": "<string>",
    "message": "Bad user input",
    "type": "<string>",
    "authorities": [
      "<string>"
    ]
  },
  "stackTrace": "<string>",
  "operationErrors": [
    {
      "code": "authentication-required",
      "message": "Full Authentication Required"
    }
  ]
}

{
  "operationError": {
    "code": "<string>",
    "message": "Bad user input",
    "type": "<string>",
    "authorities": [
      "<string>"
    ]
  },
  "stackTrace": "<string>",
  "operationErrors": [
    {
      "code": "ACCESS_FORBIDDEN",
      "message": "Access Denied"
    }
  ]
}