// Add this function to your web app
function normalizePhoneNumber(phoneNumber) {
    if (!phoneNumber) return "";
    
    // Remove all non-digit characters except leading +
    if (phoneNumber.startsWith('+')) {
        return '+' + phoneNumber.slice(1).replace(/\D/g, '');
    } else {
        return phoneNumber.replace(/\D/g, '');
    }
}

// Use it when saving the phone number
const normalizedPhone = normalizePhoneNumber(userPhone);
await db.collection('telegramVerifications').doc(telegramCode).set({
    userId: userId,
    phone: normalizedPhone, // Store normalized phone number
    createdAt: firebase.firestore.FieldValue.serverTimestamp()
});