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I have added below code to show currency switcher dropdown on the WooCommerce checkout page which is working fine, but I don’t want to show currency switcher field if anyone has added product from "Games" category and use only default store currency

Code 1

add_action('woocommerce_before_checkout_billing_form', 'wps_add_select_checkout_field');

function wps_add_select_checkout_field( $checkout ) {

    echo '<label for="payment_option" class="payment_option">'.__('Preferred currency').'</label>';

    echo '<div class="own">', do_shortcode('[woocs]'), '</div>';

    return $checkout;

}



//* Process the checkout

add_action('woocommerce_checkout_process', 'wps_select_checkout_field_process');

function wps_select_checkout_field_process() {

    global $woocommerce;

    // Check if set, if its not set add an error.

    if ($_POST['payopt'] == "blank")

     wc_add_notice( '<strong>Please select a currency</strong>', 'error' );

}

Based on this answer thread: Checking cart items for a product category in Woocommerce
I have tried below code and I think something is missing, If I am using below code it's not showing currency switcher at all even if product is from "Games" or other categories.

Code 2

add_action('woocommerce_before_cart', 'check_product_category_in_cart');

function check_product_category_in_cart() {

    // Here set your product categories in the array (can be IDs, slugs or names)

    $categories = array('games');

    $found      = false; // Initializing



    // Loop through cart items      

    foreach ( WC()->cart->get_cart() as $cart_item ) {

        // If product categories is found

        if ( !has_term( $categories, 'product_cat', $cart_item['product_id'] ) ) {

            $found = true; // Set to true

            break; // Stop the loop

        }

    }



    // If any defined product category is found, run below code

    if ( $found ) {

        add_action('woocommerce_before_checkout_billing_form', 'wps_add_select_checkout_field');

        function wps_add_select_checkout_field( $checkout ) {

            echo '<label for="payment_option" class="payment_option">'.__('Preferred currency').'</label>';

            echo '<div class="own">', do_shortcode('[woocs]'), '</div>';

            return $checkout;

        }

        //* Process the checkout

        add_action('woocommerce_checkout_process', 'wps_select_checkout_field_process');

        function wps_select_checkout_field_process() {

            global $woocommerce;

            // Check if set, if its not set add an error.

            if ($_POST['payopt'] == "blank")

             wc_add_notice( '<strong>Please select a currency</strong>', 'error' );

        }

    }

}

Do you have any other suggestion for the same? Where I can add currency switcher on checkout page based on cart product category. Code 1 is working fine on the checkout page but I don't want to run that code if product category is games.

You are not using the correct hook as woocommerce_before_cart action hook is only triggered in cart page, but not in checkout and it can't work this way. Instead try to use the following:

// Utility function that checks if at least a cart items remains to a product category

function has_product_category_in_cart( $product_category ) {

    // Loop through cart items

    foreach ( WC()->cart->get_cart() as $cart_item ) {

        // If any product category is found in cart items

        if ( has_term( $product_category, 'product_cat', $cart_item['product_id'] ) ) {

            return true;

        }

    }

    return false;

}



// Add a custom select field in checkout

add_action('woocommerce_before_checkout_billing_form', 'add_custom_checkout_select_field');

function add_custom_checkout_select_field( $checkout ) {

    // Here set in the function your product category term ID, slugs, names or array

    if ( ! has_product_category_in_cart( 'games' ) && shortcode_exists( 'woocs' ) ) {

        echo '<label for="payment_option" class="payment_option">'.__('Preferred currency').'</label>';

        echo '<div class="own">' . do_shortcode('[woocs]') . '</div>';

    }

}



// Custom Checkout fields validation

add_action('woocommerce_checkout_process', 'custom_checkout_select_field_validation');

function custom_checkout_select_field_validation() {

    if ( isset($_POST['payopt']) && empty($_POST['payopt']) )

        wc_add_notice( '<strong>Please select a currency</strong>', 'error' );

}

Code goes in function.php file of your active child theme (active theme). Untested but it should works.