curl --request GET \
  --url https://api.lemlist.com/api/sequences/{sequenceId}/steps/{stepId}/sender \
  --header 'Authorization: Basic <encoded-value>'

import requests

url = "https://api.lemlist.com/api/sequences/{sequenceId}/steps/{stepId}/sender"

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/sequences/{sequenceId}/steps/{stepId}/sender', 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/sequences/{sequenceId}/steps/{stepId}/sender")

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/sequences/{sequenceId}/steps/{stepId}/sender",
  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": {
    "sequenceId": "seq_A1b2C3d4E5f6G7h8J",
    "stepId": "stp_A1b2C3d4E5f6G7h8I",
    "stepType": "email",
    "sender": {
      "userId": "usr_A1b2C3d4E5f6G7h8K",
      "channel": {
        "type": "email",
        "id": "usm_A1b2C3d4E5f6G7h8L",
        "alias": "john@example.com"
      }
    }
  }
}

{
  "error": "Wrong param id",
  "code": "WRONG_PARAM_ID"
}

The authentication you supplied is incorrect

route is available starting emailPro plan

{
  "error": "Step not found",
  "code": "SEQUENCE_STEP_NOT_FOUND"
}

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