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

import requests

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

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/senders', 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/senders")

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/senders",
  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": {
    "campaignId": "cam_A1b2C3d4E5f6G7h8M",
    "senderStrategy": "random",
    "requiredChannelTypes": [
      "email",
      "whatsapp"
    ],
    "senders": [
      {
        "userId": "usr_A1b2C3d4E5f6G7h8K",
        "name": "John Doe",
        "email": "john@example.com",
        "inPool": true,
        "channels": [
          {
            "type": "email",
            "id": "usm_A1b2C3d4E5f6G7h8L",
            "label": "john@example.com",
            "aliases": [
              "hello@example.com"
            ],
            "esp": "google",
            "inPool": true,
            "diagnostics": []
          }
        ],
        "diagnostics": [
          {
            "scope": "user",
            "type": "error",
            "code": "no_required_channel_active",
            "channelType": "whatsapp"
          }
        ]
      },
      {
        "userId": "usr_A1b2C3d4E5f6G7h8N",
        "name": "Jane Smith",
        "email": "jane@example.com",
        "inPool": false,
        "channels": [
          {
            "type": "email",
            "id": "usm_A1b2C3d4E5f6G7h8P",
            "label": "jane@example.com",
            "esp": "microsoft",
            "inPool": false,
            "diagnostics": []
          },
          {
            "type": "whatsapp",
            "id": "uwa_A1b2C3d4E5f6G7h8Q",
            "label": "+15550100199",
            "inPool": false,
            "diagnostics": []
          }
        ],
        "diagnostics": []
      }
    ]
  }
}

{
  "error": "Wrong param campaign id",
  "code": "WRONG_PARAM_CAMPAIGN_ID"
}

The authentication you supplied is incorrect

{
  "error": "Campaign not found",
  "code": "SENDER_CAMPAIGN_NOT_FOUND"
}

{
  "error": "Route bad method",
  "code": "ROUTE_BAD_METHOD"
}