How to Set Up a Buy 3 for ₹999 Offer in WooCommerce (Step-by-Step Guide)

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/**
 * Apply ₹999 for First 3 Items + Normal Pricing for Extras
 */
function apply_3_plus_pricing() {
  // Exit in admin panel
  if (is_admin() && !wp_doing_ajax()) return;

  $cart = WC()->cart;
  if (!$cart || $cart->is_empty()) return;

  $target_quantity = 3;
  $fixed_price = 999; // Changed to ₹999
  $total_items = $cart->get_cart_contents_count();

  // Apply pricing logic only if cart has 3+ items
  if ($total_items >= $target_quantity) {
    $remaining_to_count = $target_quantity;
    $first_3_total = 0;

    // Calculate value of first 3 items
    foreach ($cart->get_cart() as $cart_item) {
      $item_qty = $cart_item['quantity'];
      $item_line_total = $cart_item['line_total'];

      $take_qty = min($item_qty, $remaining_to_count);
      $proportion = $take_qty / $item_qty;
      $first_3_total += $item_line_total * $proportion;

      $remaining_to_count -= $take_qty;
      if ($remaining_to_count <= 0) break;
    }

    // Calculate price adjustment
    $adjustment = $fixed_price - $first_3_total;

    // Apply adjustment
    if ($adjustment != 0) {
      $label = ($adjustment > 0) 
        ? 'Additional Charges (First 3 Items)' 
        : 'Discount (First 3 Items)';
      
      $cart->add_fee($label, $adjustment, false);
    }

    // Updated success message
    wc_add_notice(
      sprintf('Special offer applied! First 3 items for ₹%d', $fixed_price),
      'success'
    );

  } else {
    // Updated reminder message
    if ($total_items > 0) {
      $needed = $target_quantity - $total_items;
      wc_add_notice(sprintf(
        'Add %d more item(s) to unlock first 3 items for ₹999!',
        $needed
      ), 'notice');
    }
  }
}

// Hooks remain the same
add_action('woocommerce_cart_calculate_fees', 'apply_3_plus_pricing');
add_action('woocommerce_before_cart', 'apply_3_plus_pricing');
add_action('woocommerce_before_checkout_form', 'apply_3_plus_pricing');

How It Works with ₹999 Pricing:

1. First 3 Items at Fixed ₹999
   The first 3 items in the cart (by quantity) are bundled together for ₹999 total.
2. Additional Items at Regular Price
   Any items beyond the first 3 retain their original individual pricing.
3. Automatic Price Adjustment
   • If the first 3 items’ total is ₹800: ₹199 surcharge added
   • If the first 3 items’ total is ₹1200: ₹201 discount applied
   • If exactly ₹999: No adjustment needed
4. Clear Pricing Breakdown
   • The adjustment appears as either:
     “Additional Charges (First 3 Items)” or
     “Discount (First 3 Items)”
   • Customers see exactly why their total changed

Example Scenarios:

Key Benefits

Tax Compliant
Price adjustments are shown as non-taxable fees.

Encourages Larger Orders
Customers often add extra items to maximize value from the ₹999 deal.

Clear Value Perception
“First 3 for ₹999” is easier to understand than percentage discounts.

Works with Mixed Products
Handles combinations of different priced items seamlessly.