curl --request PATCH \
  --url https://api.lemlist.com/api/sequences/{sequenceId}/steps/{stepId}/branches \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "order": [
    "seq_xzrGLxhZwoo5oxukc",
    "seq_jacL5GNH3YpNnuNQ2"
  ]
}
'

import requests

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

payload = { "order": ["seq_xzrGLxhZwoo5oxukc", "seq_jacL5GNH3YpNnuNQ2"] }
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

response = requests.patch(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PATCH',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({order: ['seq_xzrGLxhZwoo5oxukc', 'seq_jacL5GNH3YpNnuNQ2']})
};

fetch('https://api.lemlist.com/api/sequences/{sequenceId}/steps/{stepId}/branches', 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}/branches")

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

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"order\": [\n    \"seq_xzrGLxhZwoo5oxukc\",\n    \"seq_jacL5GNH3YpNnuNQ2\"\n  ]\n}"

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}/branches",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'order' => [
        'seq_xzrGLxhZwoo5oxukc',
        'seq_jacL5GNH3YpNnuNQ2'
    ]
  ]),
  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;
}

[
  {
    "sequenceId": "seq_xzrGLxhZwoo5oxukc",
    "index": 0,
    "key": "customLeadInfo",
    "customField": "variables.jobTitle",
    "customOperator": "contains",
    "customValues": [
      "CTO"
    ]
  },
  {
    "sequenceId": "seq_jacL5GNH3YpNnuNQ2",
    "index": 1,
    "key": "customLeadInfo",
    "name": "Decision makers",
    "customField": "variables.jobTitle",
    "customOperator": "contains",
    "customValues": [
      "CEO",
      "Founder"
    ]
  },
  {
    "sequenceId": "seq_Kd8pQrLm3Nv6Tz0Wy",
    "fallback": true
  }
]

{
  "error": "order must list every branch of this step exactly once, excluding the Else branch",
  "code": "SEQUENCE_BRANCH_ORDER_INVALID"
}

"The authentication you supplied is incorrect"

"route is available starting emailPro plan"

{
  "error": "Condition branches are not enabled for this team",
  "code": "SEQUENCE_BRANCH_BETA_REQUIRED"
}

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

{
  "error": "You cannot add, remove or reorder branches once leads have entered the campaign",
  "code": "SEQUENCE_BRANCH_CAMPAIGN_RUNNING"
}