curl --request POST \
  --url https://{server}/api/assets/permissions/bulk-merge/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "asset_ids": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ],
  "upsert": [
    {
      "flags": 2,
      "subject_type": "user",
      "subject_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
    }
  ],
  "remove_subjects": [
    {
      "subject_type": "user",
      "subject_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
    }
  ],
  "remove_user_ids": [
    {
      "subject_type": "user",
      "subject_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
    }
  ]
}
'

import requests

url = "https://{server}/api/assets/permissions/bulk-merge/"

payload = {
    "asset_ids": ["3c90c3cc-0d44-4b50-8888-8dd25736052a"],
    "upsert": [
        {
            "flags": 2,
            "subject_type": "user",
            "subject_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
        }
    ],
    "remove_subjects": [
        {
            "subject_type": "user",
            "subject_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
        }
    ],
    "remove_user_ids": [
        {
            "subject_type": "user",
            "subject_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
        }
    ]
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    asset_ids: ['3c90c3cc-0d44-4b50-8888-8dd25736052a'],
    upsert: [
      {
        flags: 2,
        subject_type: 'user',
        subject_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a'
      }
    ],
    remove_subjects: [{subject_type: 'user', subject_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a'}],
    remove_user_ids: [{subject_type: 'user', subject_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a'}]
  })
};

fetch('https://{server}/api/assets/permissions/bulk-merge/', 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://{server}/api/assets/permissions/bulk-merge/",
  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([
    'asset_ids' => [
        '3c90c3cc-0d44-4b50-8888-8dd25736052a'
    ],
    'upsert' => [
        [
                'flags' => 2,
                'subject_type' => 'user',
                'subject_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a'
        ]
    ],
    'remove_subjects' => [
        [
                'subject_type' => 'user',
                'subject_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a'
        ]
    ],
    'remove_user_ids' => [
        [
                'subject_type' => 'user',
                'subject_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a'
        ]
    ]
  ]),
  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://{server}/api/assets/permissions/bulk-merge/"

	payload := strings.NewReader("{\n  \"asset_ids\": [\n    \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n  ],\n  \"upsert\": [\n    {\n      \"flags\": 2,\n      \"subject_type\": \"user\",\n      \"subject_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n    }\n  ],\n  \"remove_subjects\": [\n    {\n      \"subject_type\": \"user\",\n      \"subject_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n    }\n  ],\n  \"remove_user_ids\": [\n    {\n      \"subject_type\": \"user\",\n      \"subject_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n    }\n  ]\n}")

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

	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://{server}/api/assets/permissions/bulk-merge/")
  .header("Content-Type", "application/json")
  .body("{\n  \"asset_ids\": [\n    \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n  ],\n  \"upsert\": [\n    {\n      \"flags\": 2,\n      \"subject_type\": \"user\",\n      \"subject_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n    }\n  ],\n  \"remove_subjects\": [\n    {\n      \"subject_type\": \"user\",\n      \"subject_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n    }\n  ],\n  \"remove_user_ids\": [\n    {\n      \"subject_type\": \"user\",\n      \"subject_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{server}/api/assets/permissions/bulk-merge/")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"asset_ids\": [\n    \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n  ],\n  \"upsert\": [\n    {\n      \"flags\": 2,\n      \"subject_type\": \"user\",\n      \"subject_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n    }\n  ],\n  \"remove_subjects\": [\n    {\n      \"subject_type\": \"user\",\n      \"subject_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n    }\n  ],\n  \"remove_user_ids\": [\n    {\n      \"subject_type\": \"user\",\n      \"subject_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n    }\n  ]\n}"

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