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# Cart Items Duplicate Prevention - Complete Audit

## 📋 Current Cart System Overview

The system has **3 separate carts**:
1. **Music Cart** (`$_SESSION['cart']`) - For tracks
2. **Credit Cart** (`$_SESSION['credit_cart']`) - For credit packages
3. **Ticket Cart** (`$_SESSION['ticket_cart']`) - For event tickets

**Note:** Subscriptions are NOT in cart - they go directly to Stripe Checkout

## ✅ Current Behavior by Item Type

### 1. Tracks (Music Cart) ✅ FIXED
**File:** `cart.php` lines 62-93

**Current Behavior:**
- ✅ Prevents duplicate addition
- ✅ Returns error if track already in cart
- ✅ Quantity always = 1 (only 1 license per track)
- ✅ Message: "This track is already in your cart. Only one license can be purchased per track."

**Status:** ✅ CORRECT - Only 1 license per track

### 2. Credits (Credit Cart) ✅ CORRECT
**File:** `add_to_cart.php` lines 17-36

**Current Behavior:**
- ✅ Increments quantity when already in cart
- ✅ Allows multiple credit packages
- ✅ Quantity can be > 1

**Status:** ✅ CORRECT - Credits can be purchased multiple times

### 3. Tickets (Ticket Cart) ⚠️ NEEDS REVIEW
**File:** `api/add_ticket_to_cart.php` lines 81-97

**Current Behavior:**
- ⚠️ Increments quantity when already in cart
- ⚠️ Has per-purchase limits (MAX_TICKETS_PER_PURCHASE)
- ⚠️ Checks availability

**Status:** ⚠️ Allows multiple tickets per event (may be intentional)

### 4. Subscriptions (NOT IN CART) ✅ FIXED
**File:** `subscribe.php` lines 42-45

**Current Behavior:**
- Subscriptions go directly to Stripe Checkout (not in cart)
- ✅ Now prevents duplicate subscription creation
- ✅ Checks for existing active subscription before creating new one
- ✅ Shows error message if user already has active subscription
- Handled separately via Stripe subscription management

**Status:** ✅ FIXED - Prevents multiple active subscriptions

## 🔍 Analysis: Should Subscriptions Prevent Duplicates?

### Question: Can users have multiple active subscriptions?

**Current Implementation:**
- Subscriptions are managed by Stripe
- User can only have ONE active subscription at a time
- Stripe handles subscription upgrades/downgrades
- System checks: `hasActiveSubscription()` in `utils/subscription_helpers.php`

**Answer:** Subscriptions are already limited to one active subscription per user (handled by Stripe, not cart)

## 📝 Recommendations

### ✅ Credits - Keep Current Behavior
**Reason:** Users should be able to purchase multiple credit packages
**Action:** No changes needed

### ✅ Tracks - Already Fixed
**Reason:** Only 1 license per track
**Action:** Already implemented

### ⚠️ Subscriptions - Verify Stripe Logic
**Action:** Check if Stripe prevents multiple active subscriptions (should be automatic)

## 🎯 Summary

| Item Type | Duplicate Prevention | Quantity Limit | Status |
|-----------|---------------------|---------------|--------|
| **Tracks** | ✅ Yes (prevents duplicate) | 1 | ✅ Fixed |
| **Credits** | ❌ No (allows multiple) | Unlimited | ✅ Correct |
| **Tickets** | ❌ No (allows multiple) | Per-purchase limit | ⚠️ Review if needed |
| **Subscriptions** | ✅ Yes (prevents duplicate) | 1 (one active at a time) | ✅ Fixed |