curl --request POST \
  --url https://api.lemlist.com/api/campaigns/{campaignId}/abm-leads \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "leadIds": [
    "123456789",
    "987654321"
  ]
}
'

import requests

url = "https://api.lemlist.com/api/campaigns/{campaignId}/abm-leads"

payload = { "leadIds": ["123456789", "987654321"] }
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({leadIds: ['123456789', '987654321']})
};

fetch('https://api.lemlist.com/api/campaigns/{campaignId}/abm-leads', 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}/abm-leads")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"leadIds\": [\n    \"123456789\",\n    \"987654321\"\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/campaigns/{campaignId}/abm-leads",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'leadIds' => [
        '123456789',
        '987654321'
    ]
  ]),
  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;
}

{
  "data": {
    "addedCount": 1,
    "alreadyInCampaignCount": 0,
    "skipped": [
      {
        "leadId": "987654321",
        "code": "ABS_CONTACT_SOURCING_CONTACT_ON_ANOTHER_COMPANY"
      }
    ]
  }
}

{
  "error": "Too many leads selected",
  "code": "ABS_ENGAGE_TOO_MANY_LEADS"
}

{
  "error": "Beta is not enabled",
  "code": "BETA_NOT_ENABLED"
}

{
  "error": "This campaign is not an ABM campaign",
  "code": "ABS_ENGAGE_CAMPAIGN_NOT_ABM"
}