curl --request PATCH \
  --url https://app.launchdarkly.com/api/v2/roles/{customRoleKey} \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "patch": [
    {
      "op": "add",
      "path": "/policy/0",
      "value": {
        "actions": [
          "updateOn"
        ],
        "effect": "allow",
        "resources": [
          "proj/*:env/qa:flag/*"
        ]
      }
    }
  ]
}
'

import requests

url = "https://app.launchdarkly.com/api/v2/roles/{customRoleKey}"

payload = { "patch": [
        {
            "op": "add",
            "path": "/policy/0",
            "value": {
                "actions": ["updateOn"],
                "effect": "allow",
                "resources": ["proj/*:env/qa:flag/*"]
            }
        }
    ] }
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    patch: [
      {
        op: 'add',
        path: '/policy/0',
        value: {actions: ['updateOn'], effect: 'allow', resources: ['proj/*:env/qa:flag/*']}
      }
    ]
  })
};

fetch('https://app.launchdarkly.com/api/v2/roles/{customRoleKey}', 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://app.launchdarkly.com/api/v2/roles/{customRoleKey}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'patch' => [
        [
                'op' => 'add',
                'path' => '/policy/0',
                'value' => [
                                'actions' => [
                                                                'updateOn'
                                ],
                                'effect' => 'allow',
                                'resources' => [
                                                                'proj/*:env/qa:flag/*'
                                ]
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "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://app.launchdarkly.com/api/v2/roles/{customRoleKey}"

	payload := strings.NewReader("{\n  \"patch\": [\n    {\n      \"op\": \"add\",\n      \"path\": \"/policy/0\",\n      \"value\": {\n        \"actions\": [\n          \"updateOn\"\n        ],\n        \"effect\": \"allow\",\n        \"resources\": [\n          \"proj/*:env/qa:flag/*\"\n        ]\n      }\n    }\n  ]\n}")

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

	req.Header.Add("Authorization", "<api-key>")
	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.patch("https://app.launchdarkly.com/api/v2/roles/{customRoleKey}")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"patch\": [\n    {\n      \"op\": \"add\",\n      \"path\": \"/policy/0\",\n      \"value\": {\n        \"actions\": [\n          \"updateOn\"\n        ],\n        \"effect\": \"allow\",\n        \"resources\": [\n          \"proj/*:env/qa:flag/*\"\n        ]\n      }\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.launchdarkly.com/api/v2/roles/{customRoleKey}")

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

request = Net::HTTP::Patch.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"patch\": [\n    {\n      \"op\": \"add\",\n      \"path\": \"/policy/0\",\n      \"value\": {\n        \"actions\": [\n          \"updateOn\"\n        ],\n        \"effect\": \"allow\",\n        \"resources\": [\n          \"proj/*:env/qa:flag/*\"\n        ]\n      }\n    }\n  ]\n}"

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

{
  "_id": "1234a56b7c89d012345e678f",
  "_links": {},
  "key": "example-custom-role",
  "name": "Example custom role",
  "policy": [
    {
      "effect": "allow",
      "resources": [
        "proj/*:env/*;qa_*:/flag/*"
      ],
      "notResources": [
        "<string>"
      ],
      "actions": [
        "*"
      ],
      "notActions": [
        "<string>"
      ]
    }
  ],
  "_access": {
    "denied": [
      {
        "action": "<string>",
        "reason": {
          "effect": "allow",
          "resources": [
            "proj/*:env/*;qa_*:/flag/*"
          ],
          "notResources": [
            "<string>"
          ],
          "actions": [
            "*"
          ],
          "notActions": [
            "<string>"
          ],
          "role_name": "<string>"
        }
      }
    ],
    "allowed": [
      {
        "action": "<string>",
        "reason": {
          "effect": "allow",
          "resources": [
            "proj/*:env/*;qa_*:/flag/*"
          ],
          "notResources": [
            "<string>"
          ],
          "actions": [
            "*"
          ],
          "notActions": [
            "<string>"
          ],
          "role_name": "<string>"
        }
      }
    ]
  },
  "description": "This custom role is just an example",
  "basePermissions": "reader",
  "resourceCategory": "<string>",
  "assignedTo": {
    "membersCount": 123,
    "teamsCount": 123
  },
  "_presetBundleVersion": 123,
  "_presetStatements": [
    {
      "effect": "allow",
      "resources": [
        "proj/*:env/*;qa_*:/flag/*"
      ],
      "notResources": [
        "<string>"
      ],
      "actions": [
        "*"
      ],
      "notActions": [
        "<string>"
      ]
    }
  ]
}

{
  "code": "invalid_request",
  "message": "Invalid request body"
}

{
  "code": "unauthorized",
  "message": "Invalid access token"
}

{
  "code": "not_found",
  "message": "Invalid resource identifier"
}

{
  "code": "optimistic_locking_error",
  "message": "Conflict. Optimistic lock error. Try again later."
}

{
  "code": "rate_limited",
  "message": "You've exceeded the API rate limit. Try again later."
}