How to Restrict WooCommerce Product Purchases Based on Previous Purchases?

Verifying User Product Purchases in WooCommerce

Problem

In WooCommerce, users must be restricted from purchasing certain products (e.g., "c", "d", "e") unless they have previously acquired specific "gatekeeper" products (e.g., "a", "b").

Solution

By implementing a conditional function, you can determine whether a user has purchased the required "gatekeeper" products in the past. Here's the code to achieve this:

function has_bought_items() {
    $bought = false;

    $prod_arr = array( '21', '67' );

    $customer_orders = get_posts( array(
        'numberposts' => -1,
        'meta_key'    => '_customer_user',
        'meta_value'  => get_current_user_id(),
        'post_type'   => 'shop_order',
        'post_status' => 'wc-completed'
    ) );
    foreach ( $customer_orders as $customer_order ) {
        $order_id = method_exists( $order, 'get_id' ) ? $order->get_id() : $order->id;
        $order = wc_get_order( $customer_order );

        foreach ($order->get_items() as $item) {
            if ( version_compare( WC_VERSION, '3.0', '<' ) ) 
                $product_id = $item['product_id'];
            else
                $product_id = $item->get_product_id();

            if ( in_array( $product_id, $prod_arr ) ) 
                $bought = true;
        }
    }

    return $bought;
}

Implementation

Usage:

• Shop Page: Override loop/add-to-cart.php in your child theme and apply the following logic:

$restricted_products = array( '20', '32', '75' );
$product_id = method_exists( $product, 'get_id' ) ? $product->get_id() : $product->id;

if ( !has_bought_items() && in_array( $product_id, $restricted_products ) ) { 
    // Display inactive add-to-cart button
} else { 
    // Display normal add-to-cart button
}

• Product Pages: Override relevant templates in single-product/add-to-cart folder and use the same logic as above.

By applying this code, you effectively restrict access to specific products based on prior purchases, enhancing the user experience and ensuring that customers have access to only relevant items.

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