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async function purchaseTelegramPremium(userId, plan) {
  try {
    const response = await fetch('', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': 'Bearer YOUR_API_KEY'
      },
      body: JSON.stringify({
        quantity,
        recipient_hash: 'user_telegram_hash',
        username: 'user_telegram_username'
      })
    });
    const data = await response.json();
    return data;
  } catch (error) {
    console.error('Error purchasing Telegram Premium:', error);
    throw error;
  }
}