import { MailChannels } from "mailchannels-sdk";

const { PARENT_API_KEY, SUB_ACCOUNT_HANDLE, SEND_LIMIT } = process.env;
if (!PARENT_API_KEY) throw new Error("Set PARENT_API_KEY (a parent-account API key) before running");
if (!SUB_ACCOUNT_HANDLE) throw new Error("Set SUB_ACCOUNT_HANDLE (the sub-account to set a limit on)");
if (!SEND_LIMIT) throw new Error("Set SEND_LIMIT (maximum sends per billing period, integer >= 0)");

const mailchannels = new MailChannels(PARENT_API_KEY);

const { success, error } = await mailchannels.subAccounts.setLimit(SUB_ACCOUNT_HANDLE, {
  sends: Number(SEND_LIMIT),
});

if (!success) {
  console.error("Set sub-account limit failed:", error);
  process.exit(1);
}
console.log({ success });

import os
import sys

import mailchannels

parent_api_key = os.environ.get("PARENT_API_KEY")
handle = os.environ.get("SUB_ACCOUNT_HANDLE")
send_limit = os.environ.get("SEND_LIMIT")
if not parent_api_key:
    sys.exit("Set PARENT_API_KEY (a parent-account API key) before running")
if not handle:
    sys.exit("Set SUB_ACCOUNT_HANDLE (the sub-account to set a limit on)")
if not send_limit:
    sys.exit("Set SEND_LIMIT (maximum sends per billing period, integer >= 0)")

mailchannels.api_key = parent_api_key

response = mailchannels.SubAccounts.Limits.set(handle, sends=int(send_limit))

print(response)

<?php

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

use MailChannels\Client;

$parent_api_key     = getenv('PARENT_API_KEY') or exit("Error: PARENT_API_KEY is not set\n");
$sub_account_handle = getenv('SUB_ACCOUNT_HANDLE') or exit("Error: SUB_ACCOUNT_HANDLE is not set\n");
$send_limit         = getenv('SEND_LIMIT') or exit("Error: SEND_LIMIT is not set\n");

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

$response = $client->subAccounts->limits->set($sub_account_handle, sends: (int) $send_limit);

print_r($response->toArray());

curl --request PUT \
  --url https://api.mailchannels.net/tx/v1/sub-account/{handle}/limit \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <x-api-key>' \
  --data '{
  "sends": 1
}'

{
  "limit": {
    "sends": 123
  }
}