curl "https://api.callaro.ai/api/v1/bulk_call_campaigns?page=1&per_page=50"   -H "X-Api-Key: $CALLARO_API_KEY"

async function getWithBackoff(url, attempt = 0) {
  const response = await fetch(url, { headers: { 'X-Api-Key': process.env.CALLARO_API_KEY } });
  if (response.status !== 429) return response;
  const waitMs = Math.min(1000 * 2 ** attempt, 16000);
  await new Promise((resolve) => setTimeout(resolve, waitMs));
  return getWithBackoff(url, attempt + 1);
}