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

import requests

url = "https://api.lemlist.com/api/campaigns/{campaignId}/sequences"

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/campaigns/{campaignId}/sequences', 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/campaigns/{campaignId}/sequences")

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/campaigns/{campaignId}/sequences",
  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;
}

{
  "seq_rH5RD3fMkkt2gM3YC": {
    "_id": "seq_rH5RD3fMkkt2gM3YC",
    "steps": [
      {
        "_id": "stp_sFUj6keaSz9wr049M",
        "delay": 0,
        "emailTemplateId": "etp_ahlbc2yafFyu728H8",
        "type": "linkedinSend",
        "index": 1,
        "sequenceId": "seq_rH5RD3fMkkt2gM3YC",
        "sequenceStep": 0,
        "message": "Hey {{firstName}}, \n\nwe're launching an event, a place where people can regularly meet, network, and learn from each other. We would love it if you could join us for a drink & chat next week. What do you say? 😊"
      },
      {
        "_id": "stp_qsTl0LO6zkQQJQqsP",
        "delay": 1,
        "emailTemplateId": "etp_HFjUGtyDxIOxgZYcG",
        "index": 2,
        "sequenceId": "seq_rH5RD3fMkkt2gM3YC",
        "sequenceStep": 1,
        "subject": "{{firstName}}, do we count on you for the event?",
        "message": "<p style=\"margin: 0px; box-sizing: border-box;\">Hey {{firstName}},<br style=\"box-sizing: border-box;\"><br style=\"box-sizing: border-box;\"></p>\n<p style=\"margin: 0px; box-sizing: border-box;\">Do you have any plans for Thursday, 7pm?<br style=\"box-sizing: border-box;\"><br style=\"box-sizing: border-box;\"></p>\n<p style=\"margin: 0px; box-sizing: border-box;\">What about spending the evening with cool people by our office?<br style=\"box-sizing: border-box;\"><br style=\"box-sizing: border-box;\"></p>\n<p style=\"margin: 0px; box-sizing: border-box;\">We're launching an event, a place where people can regularly meet, network, and build connections that help them grow further 😊<br style=\"box-sizing: border-box;\"><br style=\"box-sizing: border-box;\"></p>\n<p style=\"margin: 0px; box-sizing: border-box;\">It would be really nice if we could count on you for the event-&nbsp;<a target=\"_blank\" style=\"color: rgb(0, 123, 255); text-decoration: none; background-color: transparent; user-select: auto; box-sizing: border-box;\" rel=\"noopener noreferrer\" href=\"{{event_link_to_send}}\">here's your invite</a>&nbsp;🔥</p><p style=\"margin: 0px; box-sizing: border-box;\"><br style=\"box-sizing: border-box;\"></p>\n<p style=\"margin: 0px; box-sizing: border-box;\">Can you make it?<br style=\"box-sizing: border-box;\"><br style=\"box-sizing: border-box;\"></p>\n<p style=\"margin: 0px; box-sizing: border-box;\">Sarah,</p><p style=\"margin: 0px; box-sizing: border-box;\">Head of Marketing</p>",
        "type": "email"
      },
      {
        "_id": "stp_pRcXzJDmOrBkFtNc3",
        "delay": 1,
        "emailTemplateId": "etp_3tjFTgdOMS6JL8U1g",
        "index": 3,
        "sequenceId": "seq_rH5RD3fMkkt2gM3YC",
        "sequenceStep": 2,
        "subject": "{{firstName}}, do we count on you for the event?",
        "message": "<p style=\"margin: 0px; box-sizing: border-box;\">So, should I add you to the list of attendees?<br style=\"box-sizing: border-box;\"><br style=\"box-sizing: border-box;\"></p>\n<p style=\"margin: 0px; box-sizing: border-box;\">We'll meet around 7pm, have a drink and exchange with entrepreneurs, marketers, and salespeople.<br style=\"box-sizing: border-box;\"><br style=\"box-sizing: border-box;\"></p>\n<p style=\"margin: 0px; box-sizing: border-box;\"><a target=\"_blank\" style=\"color: rgb(0, 123, 255); text-decoration: none; background-color: transparent; user-select: auto; box-sizing: border-box;\" rel=\"noopener noreferrer\" href=\"{{event_link_to_send}}\">Here's the link</a> if you want to join!<br style=\"box-sizing: border-box;\"><br style=\"box-sizing: border-box;\"></p>\n<p style=\"margin: 0px; box-sizing: border-box;\">We would love to have you with us for this event!<br style=\"box-sizing: border-box;\"><br style=\"box-sizing: border-box;\">Sarah</p><p style=\"margin: 0px; box-sizing: border-box;\">Head of Marketing</p>",
        "type": "email"
      },
      {
        "_id": "stp_Ae93hiemDkypHLys2",
        "delay": 2,
        "index": 4,
        "sequenceId": "seq_rH5RD3fMkkt2gM3YC",
        "sequenceStep": 3,
        "type": "conditional",
        "conditions": [
          {
            "sequenceId": "seq_jacL5GNH3YpNnuNQ2",
            "key": "customLeadInfo",
            "name": "Decision makers",
            "label": "If lead variable \"jobTitle\" contains \"CEO, Founder\"",
            "selector": "{\"$or\":[{\"variables.jobTitle\":{\"$regex\":\"CEO\",\"$options\":\"i\"}},{\"variables.jobTitle\":{\"$regex\":\"Founder\",\"$options\":\"i\"}}]}"
          },
          {
            "sequenceId": "seq_xzrGLxhZwoo5oxukc",
            "key": "customLeadInfo",
            "label": "If lead variable \"jobTitle\" contains \"CTO\"",
            "selector": "{\"variables.jobTitle\":{\"$regex\":\"CTO\",\"$options\":\"i\"}}"
          },
          {
            "sequenceId": "seq_Kd8pQrLm3Nv6Tz0Wy",
            "fallback": true
          }
        ]
      }
    ],
    "level": 0
  },
  "seq_jacL5GNH3YpNnuNQ2": {
    "_id": "seq_jacL5GNH3YpNnuNQ2",
    "steps": [
      {
        "_id": "stp_Tq5mWx8Rn2Kd7Yz3B",
        "delay": 0,
        "index": 1,
        "sequenceId": "seq_jacL5GNH3YpNnuNQ2",
        "sequenceStep": 0,
        "type": "linkedinInvite",
        "message": "Hi {{firstName}}, would love to connect ahead of the event!"
      }
    ],
    "level": 1,
    "parentId": "seq_rH5RD3fMkkt2gM3YC",
    "conditionalStepIndex": 4
  }
}

Bad team

The authentication you supplied is incorrect

Campaign not found