curl --request GET \
  --url https://api.lemlist.com/api/message-templates \
  --header 'Authorization: Basic <encoded-value>'

import requests

url = "https://api.lemlist.com/api/message-templates"

headers = {"Authorization": "Basic <encoded-value>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Basic <encoded-value>'}};

fetch('https://api.lemlist.com/api/message-templates', 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/message-templates")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Basic <encoded-value>'

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

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.lemlist.com/api/message-templates",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>"
  ],
]);

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

curl_close($curl);

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

{
  "data": [
    {
      "_id": "etp_A1B2C3D4E5F6G7H8I",
      "name": "Follow-up after demo",
      "subject": "Next steps",
      "message": "<p>Hi {{firstName}},</p><p>Thanks for your time yesterday.</p>",
      "cc": [],
      "tags": [
        "follow-up"
      ],
      "createdBy": "usr_A1B2C3D4E5F6G7H8I",
      "createdAt": "2026-09-01T10:00:00.000Z"
    }
  ],
  "meta": {
    "pagination": {
      "page": 1,
      "limit": 50,
      "totalRecords": 1,
      "totalPages": 1
    }
  }
}

{
  "error": "Validation error",
  "code": "VALIDATION_ERROR"
}

"The authentication you supplied is incorrect"