Code-Snippets-Functions/Execute a function on a child site/WooCommerce/add-proceed-to-checkout-button.txt

function wc_add_to_cart_message_html_custom_fun( $message, $products, $show_qty ) {
    $button = '<a href="' . esc_url( wc_get_checkout_url() ) . '" tabindex="1" class="button wc-forward">' . esc_html__( 'Proceed to checkout', 'woocommerce' ) . '</a>';
    return $message . ' ' . $button;
}
add_filter( 'wc_add_to_cart_message_html', 'wc_add_to_cart_message_html_custom_fun', 10, 3 );