curl --request PATCH \
  --url https://app.tryspecter.com/api/v1/lists/people/{listId} \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "add_ids": [
    "per_fac724403e8a4e738b736166"
  ],
  "delete_ids": []
}
'

import requests

url = "https://app.tryspecter.com/api/v1/lists/people/{listId}"

payload = {
    "add_ids": ["per_fac724403e8a4e738b736166"],
    "delete_ids": []
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({add_ids: ['per_fac724403e8a4e738b736166'], delete_ids: []})
};

fetch('https://app.tryspecter.com/api/v1/lists/people/{listId}', 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.tryspecter.com/api/v1/lists/people/{listId}",
  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([
    'add_ids' => [
        'per_fac724403e8a4e738b736166'
    ],
    'delete_ids' => [
        
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($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.tryspecter.com/api/v1/lists/people/{listId}"

	payload := strings.NewReader("{\n  \"add_ids\": [\n    \"per_fac724403e8a4e738b736166\"\n  ],\n  \"delete_ids\": []\n}")

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

	req.Header.Add("X-API-Key", "<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.tryspecter.com/api/v1/lists/people/{listId}")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"add_ids\": [\n    \"per_fac724403e8a4e738b736166\"\n  ],\n  \"delete_ids\": []\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.tryspecter.com/api/v1/lists/people/{listId}")

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

request = Net::HTTP::Patch.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"add_ids\": [\n    \"per_fac724403e8a4e738b736166\"\n  ],\n  \"delete_ids\": []\n}"

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

{
  "id": "dbc97c77-8928-434b-9d62-1b596719ec23",
  "name": "My Watchlist",
  "people": [
    {
      "person_id": "per_2f3c7fe468ec9fc2181bec8b",
      "created_at": "2026-07-17T16:22:17.608512Z"
    }
  ],
  "created_at": "2026-07-17T16:22:17.608512Z",
  "updated_at": "2026-07-17T16:22:17.608512Z"
}

{
  "errorCode": "INVALID_LIST_UUID",
  "message": "List id must be a valid UUID."
}

{
  "errorCode": "API_KEY_MISSING",
  "message": "No API Key was presented on the header X-API-KEY"
}

{
  "errorCode": "NOT_PERMITTED",
  "message": "You do not have permission to access this resource."
}

{
  "errorCode": "<string>",
  "message": "<string>"
}

{
  "errorCode": "<string>",
  "message": "<string>"
}