Advocates often forget the coupons they earned. This snippet adds a logged-in customer’s unused referral coupons to their cart automatically.
Before you start: read Add code snippets safely. Written for version 4.4.12. Test it on a staging site with your checkout before using it on a live store.
Consider the built-in options first
- Customers can see their unused coupons under My Account → Refer a Friend.
- With WooCommerce Subscriptions, the plugin can apply referral coupons to renewals for you. See WooCommerce Subscriptions.
- If advocates collect many small coupons, Stack rewards into one coupon may suit you better.
The snippet
add_action( 'woocommerce_cart_loaded_from_session', function ( $cart ) {
if ( ! is_user_logged_in() || ( is_admin() && ! wp_doing_ajax() ) || $cart->is_empty() ) {
return;
}
// Apply once per session, so customers can remove a coupon if they want to.
if ( ! WC()->session || WC()->session->get( 'raf_coupons_auto_applied' ) ) {
return;
}
WC()->session->set( 'raf_coupons_auto_applied', true );
$email = wp_get_current_user()->user_email;
$coupons = get_posts( array(
'post_type' => 'shop_coupon',
'post_status' => 'publish',
'numberposts' => 10,
'meta_query' => array(
array( 'key' => 'customer_email', 'value' => $email, 'compare' => 'LIKE' ),
array( 'key' => 'usage_count', 'value' => '0' ),
),
) );
foreach ( $coupons as $post ) {
if ( strpos( $post->post_title, 'RAF-' ) !== 0 ) {
continue;
}
$coupon = new WC_Coupon( $post->post_title );
$expires = $coupon->get_date_expires();
if ( $expires && $expires->getTimestamp() < time() ) {
continue;
}
if ( ! $cart->has_discount( $coupon->get_code() ) ) {
$cart->apply_coupon( $coupon->get_code() );
}
}
} );How it works
- The first time a logged-in customer’s cart loads in a session, the snippet looks for their unused, unexpired
RAF-…coupons and applies up to 10 of them. - It runs once per session. If the customer removes a coupon, it isn’t added back.
- WooCommerce still checks each coupon’s rules, such as Minimum Order and product restrictions. A coupon that doesn’t fit the cart shows WooCommerce’s usual error.
- If a coupon has Individual Use on, WooCommerce removes the other coupons. Turn off Individual Use in Advocate Reward if you want coupons to combine.
Check it worked
Log in as a customer with an unused referral coupon, add a product to the cart and open the cart. The coupon should be listed in the totals.