Ndtyjky

I am making coupon dynamically to use user email as coupon but how can I restrict user to use only one coupon per cart. If use multiple auto removed the previous one from cart.

    add_filter ( 'woocommerce_get_shop_coupon_data', 'generate_coupons', 10, 2  );

    function generate_coupons( $data, $code) {

        global $wpdb, $woocommerce;

        $vpm_options        = get_option( 'vpm_email_coupon_option_name' ); // Array of All Options

        $amount             = $vpm_options['coupon_value_3']; // coupon_discount

        $offer_type         = $vpm_options['offer_type_2'];  // Type: fixed_cart, percent, fixed_product, percent_product

        //getting the coupon input value 

        if (filter_var($code, FILTER_VALIDATE_EMAIL) && email_exists( $code )) {

            $code = $code ;

        }else{

            $code = '';

        }  

        // Check if the coupon has already been created in the database

        $sql = $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_title = %s AND post_type = 'shop_coupon' AND post_status = 'publish' ORDER BY post_date DESC LIMIT 1;", $code );

        $coupon_id = $wpdb->get_var( $sql );



        if ( empty( $coupon_id ) ) {

            // Create a coupon with the properties you need

            $data = array(

                'discount_type'              => $offer_type,

                'coupon_amount'              => $amount, // value

                'product_ids'                => array(),

                'exclude_product_ids'        => array(),

                'usage_limit'                => '',

                'usage_limit_per_user'       => '',//Limit

                'limit_usage_to_x_items'     => '',

                'usage_count'                => '',

                'expiry_date'                => '2020-12-31', // YYYY-MM-DD

            );

            // Save the coupon in the database

            $coupon = array(

                'post_title'    => $code,

                'post_content'  => '',

                'post_status'   => 'publish',

                'post_author'   => 1,

                'post_type'     => 'shop_coupon'

            );

            $new_coupon_id = wp_insert_post( $coupon );



            // Write the $data values into postmeta table

            foreach ($data as $key => $value) {

                update_post_meta( $new_coupon_id, $key, $value );

            }

            //apply the coupon 

            $woocommerce->cart->add_discount( $code );

            return $data;

        }

    }

The following code will remove the first applied coupon, if customer applies another coupon code, so there will be only one applied coupon in cart (the last applied coupon):

add_action( 'woocommerce_before_calculate_totals', 'one_applied_coupon_only', 10, 1 );

function one_applied_coupon_only( $cart ) {

    if ( is_admin() && ! defined( 'DOING_AJAX' ) )

        return;



    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )

        return;



    // For more than 1 applied coupons only

    if (  sizeof($cart->get_applied_coupons()) > 1 && $coupons = $cart->get_applied_coupons() ){

        // Remove the first applied coupon keeping only the last appield coupon

        $cart->remove_coupon( reset($coupons) );

    }

}

Code goes in function.php file of your active child theme (active theme). Tested and works.