BOT.PHP PATCH

Find checkout URL line in bot.php. It may look like this:

$checkoutUrl = $BASE_URL . "/checkout.php?ref=" . urlencode($ref) . "&amount=" . urlencode($amount);

Replace with:

$checkoutUrl = $BASE_URL . "/checkout.php?ref=" . urlencode($ref) . "&amount=" . urlencode($amount) . "&v=" . time();

This forces Telegram WebApp to load fresh checkout.php instead of cached old version.