Add restriction to WooCommerce coupons by allowed user ID

Question

Let's say i'm using this code to create a coupon:

$coupon_code = 'CODEOFF';
$amount = '10';
$discount_type = 'percent';
                    
$coupon = array(
    'post_title' => $coupon_code,
    'post_status' => 'publish',
    'post_author' => 1,
    'post_type'     => 'shop_coupon'
);
                    
$new_coupon_id = wp_insert_post( $coupon );
                    
update_post_meta( $new_coupon_id, 'discount_type', $discount_type );
update_post_meta( $new_coupon_id, 'coupon_amount', $amount );
update_post_meta( $new_coupon_id, 'individual_use', 'yes' );
update_post_meta( $new_coupon_id, 'product_ids', $some_id );
update_post_meta( $new_coupon_id, 'usage_limit', '1' );
update_post_meta( $new_coupon_id, 'expiry_date', $some_date );

Now I want to limit this code for only one user.

There is an option to use update_post_meta( $new_coupon_id, 'customer_email', '' );, but my users don't have emails.

How can I limit this coupon to a user using that user's ID?

Answer 1

To keep it dynamic, you can use the following code to add a new field to the usage restriction tab:

// Add new field - usage restriction tab
function action_woocommerce_coupon_options_usage_restriction( $coupon_get_id, $coupon ) {
    woocommerce_wp_text_input( array( 
        'id' => 'customer_user_id',  
        'label' => __( 'User ID restrictions', 'woocommerce' ),  
        'placeholder' => __( 'No restrictions', 'woocommerce' ),  
        'description' => __( 'List of allowed user IDs. Separate user IDs with commas.', 'woocommerce' ),  
        'desc_tip' => true,  
        'type' => 'text',  
    )); 
}
add_action( 'woocommerce_coupon_options_usage_restriction', 'action_woocommerce_coupon_options_usage_restriction', 10, 2 );

// Save
function action_woocommerce_coupon_options_save( $post_id, $coupon ) {
    // Isset
    if ( isset ( $_POST['customer_user_id'] ) ) {
        $coupon->update_meta_data( 'customer_user_id', sanitize_text_field( $_POST['customer_user_id'] ) );
        $coupon->save();
    }
}
add_action( 'woocommerce_coupon_options_save', 'action_woocommerce_coupon_options_save', 10, 2 );

Where you can enter the userID(s), separated by commas. (see attached image)

---

Along with this code for the coupon validation:

// Valid
function filter_woocommerce_coupon_is_valid( $valid, $coupon, $discount ) {
    // Get meta
    $customer_user_id = $coupon->get_meta( 'customer_user_id' );

    // NOT empty
    if ( ! empty( $customer_user_id ) ) {
        // Convert string to array
        $customer_user_id = explode( ', ', $customer_user_id );
    
        // Get current user id
        $user_id = get_current_user_id();
        
        if ( ! in_array( $user_id, $customer_user_id ) ) {
            $valid = false;
            
            if ( ! $valid ) {
                throw new Exception( __( 'My error message', 'woocommerce' ), 109 );
            }
        }
    }

    return $valid;
}
add_filter( 'woocommerce_coupon_is_valid', 'filter_woocommerce_coupon_is_valid', 10, 3 );

Answer 2

There is no direct way of restricting coupons by user ID. But there is a workaround by adding user ID with coupon metadata.

$user_id = get_current_user_id();
update_post_meta( $new_coupon_id, 'couponuserid', $user_id );

and checking hen applying the coupon.

add_filter( 'woocommerce_coupon_is_valid', function( $is_valid, $coupon ) {

    /**
     * Selected coupons allowed only for selected User IDs
     */
    $is_userid_coupon = get_post_meta( $coupon->get_id(), 'couponuserid', true );
    if ( isset( $is_userid_coupon ) ) {
        $user = wp_get_current_user();
        if ( $user->ID && $user->ID == get_post_meta( $coupon->get_id(), 'couponuserid', true ) ) {
            return true;
        }
    }

    return $is_valid;
}, 100, 2 );