WooCommerce - Purchase Minimum Amount

functions.php

add_action( 'woocommerce_checkout_process', 'wc_minimum_order_amount' );
add_action( 'woocommerce_before_cart' , 'wc_minimum_order_amount' );
 
function wc_minimum_order_amount() {
	// Set this variable to specify a minimum order value
	$minimum = 50;

	if ( WC()->cart->total < $minimum ) {

		if( is_cart() ) {

			wc_print_notice( 
				sprintf( 'You must have an order with a minimum of %s to place your order, your current order total is %s.' , 
					woocommerce_price( $minimum ), 
					woocommerce_price( WC()->cart->total )
				), 'error' 
			);

		} else {

			wc_add_notice( 
				sprintf( 'You must have an order with a minimum of %s to place your order, your current order total is %s.' , 
					woocommerce_price( $minimum ), 
					woocommerce_price( WC()->cart->total )
				), 'error' 
			);

		}
	}

}