curl --request POST \
  --url https://api.lemlist.com/api/companies \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "Acme Corp",
  "domain": "acme.com",
  "linkedinUrl": "https://linkedin.com/company/acme",
  "industry": "Technology",
  "location": "San Francisco, CA"
}
'

import requests

url = "https://api.lemlist.com/api/companies"

payload = {
    "name": "Acme Corp",
    "domain": "acme.com",
    "linkedinUrl": "https://linkedin.com/company/acme",
    "industry": "Technology",
    "location": "San Francisco, CA"
}
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({
    name: 'Acme Corp',
    domain: 'acme.com',
    linkedinUrl: 'https://linkedin.com/company/acme',
    industry: 'Technology',
    location: 'San Francisco, CA'
  })
};

fetch('https://api.lemlist.com/api/companies', 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/companies")

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  \"name\": \"Acme Corp\",\n  \"domain\": \"acme.com\",\n  \"linkedinUrl\": \"https://linkedin.com/company/acme\",\n  \"industry\": \"Technology\",\n  \"location\": \"San Francisco, CA\"\n}"

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

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.lemlist.com/api/companies",
  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([
    'name' => 'Acme Corp',
    'domain' => 'acme.com',
    'linkedinUrl' => 'https://linkedin.com/company/acme',
    'industry' => 'Technology',
    'location' => 'San Francisco, CA'
  ]),
  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;
}

{
  "success": true,
  "data": {
    "_id": "cpn_gG7PsmZFpEAnpMCHO",
    "teamId": "tea_8QvkOiBfPdb2ZRhHi",
    "domain": "acme.com",
    "fields": {
      "name": "Acme Corp",
      "industry": "Technology",
      "location": "San Francisco, CA"
    },
    "ownerId": "usr_ahfFktBBHUIxbVG5P",
    "source": "api",
    "createdAt": "2025-10-28T00:40:37.917Z",
    "createdBy": "usr_ahfFktBBHUIxbVG5P",
    "created": false,
    "updated": true
  }
}

{
  "success": true,
  "data": {
    "_id": "cpn_gG7PsmZFpEAnpMCHO",
    "teamId": "tea_8QvkOiBfPdb2ZRhHi",
    "domain": "acme.com",
    "linkedinUrl": "https://www.linkedin.com/company/acme",
    "fields": {
      "name": "Acme Corp",
      "industry": "Technology",
      "location": "San Francisco, CA"
    },
    "ownerId": "usr_ahfFktBBHUIxbVG5P",
    "source": "api",
    "createdAt": "2025-10-28T00:40:37.917Z",
    "createdBy": "usr_ahfFktBBHUIxbVG5P",
    "created": true
  }
}

{
  "success": false,
  "error": {
    "code": "MISSING_REQUIRED_FIELD",
    "message": "A required field is missing: name"
  }
}

"The authentication you supplied is incorrect"

{
  "success": false,
  "error": {
    "code": "COMPANY_NOT_FOUND_BY_ID",
    "message": "No company found with id"
  }
}

{
  "success": false,
  "error": {
    "code": "COMPANY_IDENTIFIER_CONFLICT",
    "message": "An identifier (domain, linkedinUrl or salesnavUrl) already belongs to another company"
  }
}