How to replace one coupon to another after coupon added?

patrick

I've got two coupons, one $10 and the other $5. I want to do next if the price is less than $50 and the customer enters a $10 discount coupon, replace that coupon with a $5 coupon. like

// Change price for discount
if( ! function_exists('custom_discount') ){

  function custom_discount( $price, $values, $instance ) {

    //$price represents the current product price without discount
    //$values represents the product object
    //$instance represent the cart object

    //Get subtotal
    $subtotal = WC()->cart->get_subtotal();
    $coupon = WC()->cart->get_discount_total();

    //if price < 50 and we have active coupon then we need decrease price to $5
    if( $subtotal < 50 && ! empty( WC()->cart->get_applied_coupons() ) ){
      $price = $subtotal  - 5; //Wrong way ...
    }
    return $price;
  }

  add_filter( 'woocommerce_get_discounted_price', 'custom_discount', 10, 3);

}

anderson

You should use an action hook woocommerce_calculate_totals which must be related to cart and Ajax-enabled. Below code will go in unctions.php file

add_action( 'woocommerce_calculate_totals', 'discount_based_on_cart_subtotal', 10, 1 );
function discount_based_on_cart_subtotal( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    // Avoiding hook repetitions
    if ( did_action( 'woocommerce_calculate_totals' ) >= 2 )
        return;

    // Your coupons settings below
    $coupon_05_off = '$5-Off';
    $coupon_10_off = '$10-Off';

    // When cart subtotal is below 50
    if ( $cart->subtotal < 50 ) {
        if ( $cart->has_discount( $coupon_10_off ) ) {
            $cart->remove_coupon( $coupon_10_off ); // Remove $10.00 fixed discount coupon
            if ( ! $cart->has_discount( $coupon_05_off ) ) {
                 $cart->apply_coupon( $coupon_05_off ); // Add $5.00 fixed discount coupon
            }
        }

    }
    // When cart subtotal is up to 50
    else {
        if ( $cart->has_discount( $coupon_05_off ) ) {
            $cart->remove_coupon( $coupon_05_off ); // Remove $5.00 fixed discount coupon
            if ( ! $cart->has_discount( $coupon_10_off ) ) {
                $cart->apply_coupon( $coupon_10_off ); // Add $10.00 fixed discount coupon
            }
        }
    }
}