Custom Coupon type woocommerce wordpress

Question

I need to create custom coupon type. Because i had custom calculation for custom coupon. Anyone out there help me.

Coupon calculation: the cart has one product and value is 5000, then custom coupon code applied. The cart total need to change 2000. Similarly the cart has 2 product and value is 7000. If the custom coupon code applied, then cart total need to be 4000.

So the coupon need to make the cart total as flat 2000 for one product

Answer 1

In newer versions of WooCommerce, you will need to

1. Register a custom coupon type
2. Validate the coupon
3. Calculate & Apply the discount

Register custom coupon type

add_filter( 'woocommerce_coupon_discount_types', 'custom_coupon_type',10, 1);
function custom_coupon_type( $discount_types ) {        
    $discount_types['my_type'] =__( 'My New Coupon Type', 'woocommerce' );  
    return $discount_types;
}

Validate the coupon

add_filter('woocommerce_coupon_is_valid_for_product', 'validate_custom_coupon', 10, 4);
function validate_custom_coupon($valid, $product, $coupon, $values){
    if ( ! $coupon->is_type( array( 'my_type' ) ) ) {
        return $valid;
    }

    $product_cats = wp_get_post_terms( $product->id, 'product_cat', array( "fields" => "ids" ) );
    
    // SPECIFIC PRODUCTS ARE DISCOUNTED
    if ( sizeof( $coupon->product_ids ) > 0 ) {
        if ( in_array( $product->id, $coupon->product_ids ) || ( isset( $product->variation_id ) && in_array( $product->variation_id, $coupon->product_ids ) ) || in_array( $product->get_parent(), $coupon->product_ids ) ) {
            $valid = true;
        }
    }

    // CATEGORY DISCOUNTS
    if ( sizeof( $coupon->product_categories ) > 0 ) {
        if ( sizeof( array_intersect( $product_cats, $coupon->product_categories ) ) > 0 ) {
            $valid = true;
        }
    }

    // IF ALL ITEMS ARE DISCOUNTED
    if ( ! sizeof( $coupon->product_ids ) && ! sizeof( $coupon->product_categories ) ) {            
        $valid = true;
    }
    
    // SPECIFIC PRODUCT IDs EXLCUDED FROM DISCOUNT
    if ( sizeof( $coupon->exclude_product_ids ) > 0 ) {
        if ( in_array( $product->id, $coupon->exclude_product_ids ) || ( isset( $product->variation_id ) && in_array( $product->variation_id, $coupon->exclude_product_ids ) ) || in_array( $product->get_parent(), $coupon->exclude_product_ids ) ) {
            $valid = false;
        }
    }
    
    // SPECIFIC CATEGORIES EXLCUDED FROM THE DISCOUNT
    if ( sizeof( $coupon->exclude_product_categories ) > 0 ) {
        if ( sizeof( array_intersect( $product_cats, $coupon->exclude_product_categories ) ) > 0 ) {
            $valid = false;
        }
    }

    // SALE ITEMS EXCLUDED FROM DISCOUNT
    if ( $coupon->exclude_sale_items == 'yes' ) {
        $product_ids_on_sale = wc_get_product_ids_on_sale();

        if ( isset( $product->variation_id ) ) {
            if ( in_array( $product->variation_id, $product_ids_on_sale, true ) ) {
                $valid = false;
            }
        } elseif ( in_array( $product->id, $product_ids_on_sale, true ) ) {
            $valid = false;
        }
    }

    return $valid;
}

Calculate & Apply Discount

add_filter('woocommerce_coupon_get_discount_amount', 'wc_cpn_disc', 10, 5);
function wc_cpn_disc($discount, $discounting_amount, $cart_item, $single, $coupon) {
    // IF TYPE MATCHES PERFORM CUSTOM CALCULATION
    if ($coupon->type == 'my_type')
        $discount = $cart_item['quantity'] * 2000;        
    
    return $discount;
}

---

Sources:

• @raju_odi's answer on this exact question
• @Chris Morris's answer to Woocommerce custom coupon type with custom discount always return 0

Answer 2

Please use below code in your active theme's function.php

function custom_discount_type( $discount_types ) {
    $discount_types['custom_discount'] =__( 'custom discount', 'woocommerce' );
    return $discount_types;
    }

// add the hooks
add_filter( 'woocommerce_coupon_discount_types', 'custom_discount_type',10, 1);

//function to get coupon amount for "custom_discount"
function woocommerce_coupon_get_discount_amount($discount, $discounting_amount, $cart_item, $single, $coupon) {

        if ($coupon->code == 'custom'){
        //echo "yes custom discount"; //if $coupon->type == 'fixed_cart' or 'percent' or 'fixed_product' or 'percent_product' The code Works
            $discount = $cart_item['quantity'] * 2000;
            return $discount;
            } else {
             return $discount;
            }
        }
//add hook to coupon amount hook
add_filter('woocommerce_coupon_get_discount_amount', 'woocommerce_coupon_get_discount_amount', 10, 5);

Note : Please add your added coupon name here on this line if ($coupon->code == 'your_added_coupon_here')

Working fine and tested.