import { MailChannels } from "mailchannels-sdk";

const { MAILCHANNELS_API_KEY, KEY_ID } = process.env;
if (!MAILCHANNELS_API_KEY) throw new Error("Set MAILCHANNELS_API_KEY before running");
if (!KEY_ID) throw new Error("Set KEY_ID (the signing key ID from the signature-input webhook header)");

const mailchannels = new MailChannels(MAILCHANNELS_API_KEY);

const { data, error } = await mailchannels.webhooks.getSigningKey(KEY_ID);

if (error) {
  console.error("Get signing key failed:", error);
  process.exit(1);
}
console.log(data);

import os
import sys

import mailchannels

if not os.environ.get("MAILCHANNELS_API_KEY"):
    sys.exit("Set MAILCHANNELS_API_KEY before running")

key_id = os.environ.get("KEY_ID")
if not key_id:
    sys.exit("Set KEY_ID (the signing key ID from the signature-input webhook header)")

response = mailchannels.Webhooks.public_key(key_id)

print(response)

<?php

require_once __DIR__ . '/vendor/autoload.php';

use MailChannels\Client;

$api_key = getenv('MAILCHANNELS_API_KEY') or exit("Error: MAILCHANNELS_API_KEY is not set\n");
$key_id  = getenv('KEY_ID') or exit("Error: KEY_ID is not set\n");

$client = new Client(apiKey: $api_key);

// KEY_ID is the signing key ID from the signature-input webhook header.
$response = $client->webhooks->publicKey($key_id);

print_r($response->toArray());

curl --request GET \
  --url https://api.mailchannels.net/tx/v1/webhook/public-key

{
  "id": "<string>",
  "key": "<string>"
}