curl --request PUT \
  --url https://api.lemlist.com/api/campaigns/{campaignId}/dynamic-sender-exclusions \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "senders": [
    {
      "userId": "usr_T2wWj3GOt0hXms721",
      "channels": [
        {
          "type": "email",
          "id": "usm_oZOkr8H1oFjgvDI6J"
        },
        {
          "type": "linkedin"
        }
      ]
    },
    {
      "userId": "usr_ll2LqAVvLk75ER9fv"
    }
  ]
}
'

import requests

url = "https://api.lemlist.com/api/campaigns/{campaignId}/dynamic-sender-exclusions"

payload = { "senders": [{
            "userId": "usr_T2wWj3GOt0hXms721",
            "channels": [{
                    "type": "email",
                    "id": "usm_oZOkr8H1oFjgvDI6J"
                }, { "type": "linkedin" }]
        }, { "userId": "usr_ll2LqAVvLk75ER9fv" }] }
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PUT',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    senders: [
      {
        userId: 'usr_T2wWj3GOt0hXms721',
        channels: [{type: 'email', id: 'usm_oZOkr8H1oFjgvDI6J'}, {type: 'linkedin'}]
      },
      {userId: 'usr_ll2LqAVvLk75ER9fv'}
    ]
  })
};

fetch('https://api.lemlist.com/api/campaigns/{campaignId}/dynamic-sender-exclusions', 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}/dynamic-sender-exclusions")

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

request = Net::HTTP::Put.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"senders\": [\n    {\n      \"userId\": \"usr_T2wWj3GOt0hXms721\",\n      \"channels\": [\n        {\n          \"type\": \"email\",\n          \"id\": \"usm_oZOkr8H1oFjgvDI6J\"\n        },\n        {\n          \"type\": \"linkedin\"\n        }\n      ]\n    },\n    {\n      \"userId\": \"usr_ll2LqAVvLk75ER9fv\"\n    }\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}/dynamic-sender-exclusions",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'senders' => [
        [
                'userId' => 'usr_T2wWj3GOt0hXms721',
                'channels' => [
                                [
                                                                'type' => 'email',
                                                                'id' => 'usm_oZOkr8H1oFjgvDI6J'
                                ],
                                [
                                                                'type' => 'linkedin'
                                ]
                ]
        ],
        [
                'userId' => 'usr_ll2LqAVvLk75ER9fv'
        ]
    ]
  ]),
  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": {
    "campaignId": "cam_hNtZRPpyNP6HRp4PV",
    "senderStrategy": "contactOwner",
    "source": "campaign",
    "senders": [
      {
        "userId": "usr_T2wWj3GOt0hXms721",
        "channels": [
          {
            "type": "email",
            "id": "usm_oZOkr8H1oFjgvDI6J"
          },
          {
            "type": "linkedin"
          }
        ]
      },
      {
        "userId": "usr_ll2LqAVvLk75ER9fv"
      }
    ]
  }
}

{
  "error": "A channel does not belong to the sender. Take the channel id from the team senders list: the mailbox id, the WhatsApp account id or the phone number",
  "code": "CAMPAIGN_DYNAMIC_SENDER_UNKNOWN_CHANNEL"
}

The authentication you supplied is incorrect

route is available starting emailPro plan

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

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

{
  "error": "The campaign does not use a dynamic sender strategy: its sender pool applies, not the exclusions. Set a dynamic strategy first",
  "code": "CAMPAIGN_DYNAMIC_SENDER_STATIC_STRATEGY"
}