curl --request POST \
  --url https://api.lemlist.com/api/contacts \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "jane.smith@example.com",
  "firstName": "Jane",
  "lastName": "Smith",
  "linkedinUrl": "https://linkedin.com/in/janesmith",
  "jobTitle": "Product Manager",
  "companyDomain": "acme.com"
}
'

import requests

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

payload = {
    "email": "jane.smith@example.com",
    "firstName": "Jane",
    "lastName": "Smith",
    "linkedinUrl": "https://linkedin.com/in/janesmith",
    "jobTitle": "Product Manager",
    "companyDomain": "acme.com"
}
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({
    email: 'jane.smith@example.com',
    firstName: 'Jane',
    lastName: 'Smith',
    linkedinUrl: 'https://linkedin.com/in/janesmith',
    jobTitle: 'Product Manager',
    companyDomain: 'acme.com'
  })
};

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

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  \"email\": \"jane.smith@example.com\",\n  \"firstName\": \"Jane\",\n  \"lastName\": \"Smith\",\n  \"linkedinUrl\": \"https://linkedin.com/in/janesmith\",\n  \"jobTitle\": \"Product Manager\",\n  \"companyDomain\": \"acme.com\"\n}"

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

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.lemlist.com/api/contacts",
  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([
    'email' => 'jane.smith@example.com',
    'firstName' => 'Jane',
    'lastName' => 'Smith',
    'linkedinUrl' => 'https://linkedin.com/in/janesmith',
    'jobTitle' => 'Product Manager',
    'companyDomain' => 'acme.com'
  ]),
  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": "ctc_xW8Ou6C03Csv8vatp",
    "teamId": "tea_8QvkOiBfPdb2ZRhHi",
    "emails": [
      {
        "value": "jane.smith@example.com"
      }
    ],
    "fields": {
      "firstName": "Jane",
      "lastName": "Smith",
      "jobTitle": "Product Manager"
    },
    "ownerId": "usr_ahfFktBBHUIxbVG5P",
    "source": "api",
    "createdAt": "2025-10-28T00:40:37.917Z",
    "createdBy": "usr_ahfFktBBHUIxbVG5P",
    "unsubscribed": false,
    "created": false,
    "updated": true,
    "companyLinked": false
  }
}

{
  "success": true,
  "data": {
    "_id": "ctc_xW8Ou6C03Csv8vatp",
    "teamId": "tea_8QvkOiBfPdb2ZRhHi",
    "emails": [
      {
        "value": "jane.smith@example.com"
      }
    ],
    "linkedinUrl": "https://www.linkedin.com/in/janesmith",
    "fields": {
      "firstName": "Jane",
      "lastName": "Smith",
      "jobTitle": "Product Manager"
    },
    "ownerId": "usr_ahfFktBBHUIxbVG5P",
    "source": "api",
    "createdAt": "2025-10-28T00:40:37.917Z",
    "createdBy": "usr_ahfFktBBHUIxbVG5P",
    "unsubscribed": false,
    "created": true,
    "companyLinked": true,
    "companyId": "cpn_gG7PsmZFpEAnpMCHO"
  }
}

{
  "success": false,
  "error": {
    "code": "MISSING_IDENTIFIER",
    "message": "At least one identifier is required: email, linkedinUrl or contactId"
  }
}

"The authentication you supplied is incorrect"

{
  "success": false,
  "error": {
    "code": "CONTACT_NOT_FOUND_BY_ID",
    "message": "No contact found with the provided contactId"
  }
}

{
  "success": false,
  "error": {
    "code": "CONTACT_IDENTIFIER_CONFLICT",
    "message": "An identifier (email, linkedinUrl or salesnavUrl) already belongs to another contact"
  }
}