Подключите Bulko к вашему процессу

import requests

resp = requests.post(
    "https://bulko.io/api/v1/campaigns/launch",
    headers={"Authorization": f"Bearer {API_TOKEN}"},
    json={
        "name": "Q2 Outreach",
        "subject": "{Hi|Hello} {{name}}",
        "body": "<p>Hi {{name}}, ...</p>",
        "subscriber_list_id": 42,
        "ai_rotation": True,
    },
)
campaign = resp.json()
print("Campaign", campaign["id"], "started")

const resp = await fetch(
  'https://bulko.io/api/v1/campaigns/launch',
  {
    method: 'POST',
    headers: {
      'Authorization': `Bearer ${API_TOKEN}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      name: 'Q2 Outreach',
      subject: '{Hi|Hello} {{name}}',
      body: '<p>Hi ...</p>',
      subscriber_list_id: 42,
      ai_rotation: true,
    }),
  }
);
const campaign = await resp.json();
console.log('Campaign', campaign.id, 'started');

$ch = curl_init('https://bulko.io/api/v1/campaigns/launch');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer ' . $API_TOKEN,
        'Content-Type: application/json',
    ],
    CURLOPT_POSTFIELDS => json_encode([
        'name' => 'Q2 Outreach',
        'subject' => '{Hi|Hello} {{name}}',
        'body' => '<p>Hi ...</p>',
        'subscriber_list_id' => 42,
        'ai_rotation' => true,
    ]),
]);
$campaign = json_decode(curl_exec($ch), true);