Apply specific coupon based on customer shipping zone in WooCommerce

Question

i have two coupons and multiple shipping zones

• (shipping zone A, shipping zone B, shipping zone C)
• (coupon 1) and (coupon 2). what i want is that if a user choose a specific shipping zone lets say (shipping zone C) i want to apply (coupon 2) for (shipping zone C) specifically. and (coupon 1) will be applies for all other shipping zones.

this is what i tried so far

<?php
add_action('woocommerce_before_cart', 'add_coupon_notice');
add_action('woocommerce_before_checkout_form', 'add_coupon_notice');
function add_coupon_notice()
{
    if (is_cart() || is_checkout())
    {
        global $woocommerce;
        $cart_total = WC()
            ->cart->total;
        $minimum_amount = 100;
        $currency_code = get_woocommerce_currency();
        $states = array(
            'shipping zone A',
            'shipping zone B',
            'shipping zone C'
        );
        wc_clear_notices();
        if ($cart_total < $minimum_amount && in_array(WC()
            ->customer
            ->get_shipping_state() , $states))
        {
            WC()
                ->cart
                ->apply_coupon('COUPON 1');
            wc_print_notice('You just got 15% off your order!', 'notice');
        }
        else
        {
            WC()
                ->cart
                ->apply_coupon('COUPON 2');
            wc_print_notice('You just got 15% off your order!', 'notice');
        }
        wc_clear_notices();
    }
}

Answer 1

i managed to solve it with below code.

add_action( 'woocommerce_cart_calculate_fees','woocommerce_custom_surcharge' );
    function woocommerce_custom_surcharge() {
        global $woocommerce;
        $state = $woocommerce->customer->get_shipping_state();       
        if ( $state == 'shipping zone 1' ) {
            WC()->cart->apply_coupon( 'COUPON 2' );
            WC()->cart->remove_coupon( 'COUPON 1' );   
        } else {
             WC()->cart->apply_coupon( 'COUPON 1' );
             WC()->cart->remove_coupon( 'COUPON 2' );
        } 
    }