curl --request POST \
  --url https://api.lemlist.com/api/domains-core/{domainId}/mailboxes \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "emails": [
    {
      "username": "john",
      "sendername": "John Doe",
      "assignToUser": "usr_Ye6Ta3Uo8Ic1Mn7Bh",
      "workspaceAdmin": true
    }
  ]
}
'

import requests

url = "https://api.lemlist.com/api/domains-core/{domainId}/mailboxes"

payload = { "emails": [
        {
            "username": "john",
            "sendername": "John Doe",
            "assignToUser": "usr_Ye6Ta3Uo8Ic1Mn7Bh",
            "workspaceAdmin": True
        }
    ] }
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    emails: [
      {
        username: 'john',
        sendername: 'John Doe',
        assignToUser: 'usr_Ye6Ta3Uo8Ic1Mn7Bh',
        workspaceAdmin: true
      }
    ]
  })
};

fetch('https://api.lemlist.com/api/domains-core/{domainId}/mailboxes', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

require 'uri'
require 'net/http'

url = URI("https://api.lemlist.com/api/domains-core/{domainId}/mailboxes")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"emails\": [\n    {\n      \"username\": \"john\",\n      \"sendername\": \"John Doe\",\n      \"assignToUser\": \"usr_Ye6Ta3Uo8Ic1Mn7Bh\",\n      \"workspaceAdmin\": true\n    }\n  ]\n}"

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

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.lemlist.com/api/domains-core/{domainId}/mailboxes",
  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([
    'emails' => [
        [
                'username' => 'john',
                'sendername' => 'John Doe',
                'assignToUser' => 'usr_Ye6Ta3Uo8Ic1Mn7Bh',
                'workspaceAdmin' => true
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

{
  "added": 2,
  "mailboxes": [
    {
      "_id": "dem_Rb4Nc7Fy1Hs6Jq0Wt",
      "email": "john@getacme.com",
      "assignToUser": "usr_Ye6Ta3Uo8Ic1Mn7Bh"
    },
    {
      "_id": "dem_Zp2Gx8Vm4Lk9Ds5Qe",
      "email": "jane@getacme.com",
      "assignToUser": "usr_Wf3Kp9Rd2Nz6Xc4Lj"
    }
  ]
}

{
  "error": "Match error: Expected object, got undefined"
}

{
  "error": "Unauthorized"
}

{
  "error": "You do not have permission to perform this action"
}

{
  "error": "Some emails are already taken"
}

{
  "error": "Internal error"
}

{
  "error": "Unable to verify your workspace status. Please try again in a moment."
}