const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    domains: [
      {
        domain: '<string>',
        downstreamAddress: [{priority: 1, weight: 1, port: 1, target: '<string>'}],
        settings: {
          abusePolicyOverride: true,
          spamHeaderName: '<string>',
          spamHeaderValue: '<string>'
        },
        aliases: ['<string>'],
        admins: ['<string>']
      }
    ]
  })
};

fetch('https://api.mailchannels.net/inbound/v1/domains/batch', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.mailchannels.net/inbound/v1/domains/batch"

payload = { "domains": [
        {
            "domain": "<string>",
            "downstreamAddress": [
                {
                    "priority": 1,
                    "weight": 1,
                    "port": 1,
                    "target": "<string>"
                }
            ],
            "settings": {
                "abusePolicyOverride": True,
                "spamHeaderName": "<string>",
                "spamHeaderValue": "<string>"
            },
            "aliases": ["<string>"],
            "admins": ["<string>"]
        }
    ] }
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.mailchannels.net/inbound/v1/domains/batch",
  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([
    'domains' => [
        [
                'domain' => '<string>',
                'downstreamAddress' => [
                                [
                                                                'priority' => 1,
                                                                'weight' => 1,
                                                                'port' => 1,
                                                                'target' => '<string>'
                                ]
                ],
                'settings' => [
                                'abusePolicyOverride' => true,
                                'spamHeaderName' => '<string>',
                                'spamHeaderValue' => '<string>'
                ],
                'aliases' => [
                                '<string>'
                ],
                'admins' => [
                                '<string>'
                ]
        ]
    ]
  ]),
  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;
}

curl --request POST \
  --url https://api.mailchannels.net/inbound/v1/domains/batch \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "domains": [
    {
      "domain": "<string>",
      "downstreamAddress": [
        {
          "priority": 1,
          "weight": 1,
          "port": 1,
          "target": "<string>"
        }
      ],
      "settings": {
        "abusePolicyOverride": true,
        "spamHeaderName": "<string>",
        "spamHeaderValue": "<string>"
      },
      "aliases": [
        "<string>"
      ],
      "admins": [
        "<string>"
      ]
    }
  ]
}
'

{
  "successes": [
    {
      "domain": {
        "domain": "<string>",
        "subscriptionHandle": "<string>",
        "admins": [
          "<string>"
        ],
        "downstreamAddresses": [
          {
            "priority": 1,
            "weight": 1,
            "port": 1,
            "target": "<string>"
          }
        ],
        "aliases": [
          "<string>"
        ],
        "settings": {
          "abusePolicy": "block",
          "abusePolicyOverride": true,
          "spamHeaderName": "<string>",
          "spamHeaderValue": "<string>"
        }
      },
      "code": 201,
      "comment": "<string>"
    }
  ],
  "errors": [
    {
      "domain": {
        "domain": "<string>",
        "subscriptionHandle": "<string>",
        "admins": [
          "<string>"
        ],
        "downstreamAddresses": [
          {
            "priority": 1,
            "weight": 1,
            "port": 1,
            "target": "<string>"
          }
        ],
        "aliases": [
          "<string>"
        ],
        "settings": {
          "abusePolicy": "block",
          "abusePolicyOverride": true,
          "spamHeaderName": "<string>",
          "spamHeaderValue": "<string>"
        }
      },
      "code": 201,
      "comment": "<string>"
    }
  ]
}

{
  "errors": [
    "<string>"
  ],
  "code": 123,
  "message": "<string>"
}

{
  "errors": [
    "<string>"
  ],
  "code": 123,
  "message": "<string>"
}

{
  "errors": [
    "<string>"
  ],
  "code": 123,
  "message": "<string>"
}