Code-Snippets-Functions/Execute a function on a child site/WooCommerce/replace-woocommerce-place-order-button-text-with-cart-total-and-subscription.txt

add_filter('woocommerce_order_button_text', 'subscriptions_custom_checkout_submit_button_text' );
function subscriptions_custom_checkout_submit_button_text( $button_text ) {
    if ( WC_Subscriptions_Cart::cart_contains_subscription() ) {
        $cart  = WC()->cart;
        $total = $cart->total;
        $other = false;

        // Loop through cart items
        foreach ( $cart->get_cart() as $item )  {
            $product = $item['data'];
            if( in_array( $product->get_type(), ['subscription', 'subscription_variation'] ) ) {
                $period = get_post_meta( $product->get_id(), '_subscription_period', true );
            } else {
                $other = true; // There are other items in cart
            }
        }
        // When there are only Subscriptions in cart
        if ( isset($period) && ! $other ) {
            return sprintf( __('Pay %s/%s' , 'woocommerce'), strip_tags( wc_price($total) ), ucfirst($period) );
        }
    }
    return $button_text;
}