Lifetime discounts - loyalty plugin by wpgens for woocommerce

functions.php

<?php

/**
 * Diamond Rank — Automatic 15% lifetime discount, no points.
 *
 * 1. Applies a 15% cart discount on every order for Diamond rank users.
 * 2. Disables points earning/redeeming for Diamond rank users (they get the
 *    flat discount instead).
 *
 * Requirements:
 *  - A rank with slug "diamond" must exist in the Ranks module.
 *  - Adjust the slug in DIAMOND_RANK_SLUG if your rank uses a different slug.
 */

// ── Config ──────────────────────────────────────────────────────
define('WPGL_DIAMOND_RANK_SLUG', 'diamond');   // Change if your rank slug differs
define('WPGL_DIAMOND_DISCOUNT_PCT', 15);       // Discount percentage

// ── 1. Auto-apply 15% discount at cart/checkout ─────────────────
add_action('woocommerce_cart_calculate_fees', function () {
    if (is_admin() && !defined('DOING_AJAX')) {
        return;
    }

    $user_id = get_current_user_id();
    if (!$user_id) {
        return;
    }

    // Make sure the Ranks module is loaded
    if (!class_exists('WPGL_Ranks_Core') || !WPGL_Ranks_Core::is_active()) {
        return;
    }

    // Check if the user has Diamond rank (exact match, not "or higher")
    if (!WPGL_Ranks_Core::check_user_rank($user_id, WPGL_DIAMOND_RANK_SLUG, false)) {
        return;
    }

    $cart = WC()->cart;
    if (!$cart) {
        return;
    }

    // Calculate discount on cart subtotal (excl. tax to avoid double-taxing the discount)
    $subtotal = (float) $cart->get_subtotal();
    if ($subtotal <= 0) {
        return;
    }

    $discount = round($subtotal * (WPGL_DIAMOND_DISCOUNT_PCT / 100), 2);

    // Add as a negative fee (= discount). WooCommerce will handle tax on the discounted total.
    $cart->add_fee(
        sprintf(__('Diamond Member Discount (%d%%)', 'wpgens-loyalty'), WPGL_DIAMOND_DISCOUNT_PCT),
        -$discount
    );
});

// ── 2. Disable points earning & redeeming for Diamond members ───
add_filter('wpgens_loyalty_user_can_participate', function ($is_allowed, $user_id) {
    if (!$is_allowed) {
        return false;
    }

    if (!class_exists('WPGL_Ranks_Core') || !WPGL_Ranks_Core::is_active()) {
        return $is_allowed;
    }

    // Diamond members don't use the points system — their benefit is the flat discount
    if (WPGL_Ranks_Core::check_user_rank($user_id, WPGL_DIAMOND_RANK_SLUG, false)) {
        return false;
    }

    return $is_allowed;
}, 20, 2);