WooCommerce set minimum cart value limit and add surcharge if Cart value low

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In WooCommerce base online shopping site Some time you or your client would like to set minimum cart value, and add additional surcharge in Cart total if Customer Cart value ( sum of added Item into cart ) is  not equal more than minimum limit.

#
add_action( 'woocommerce_cart_calculate_fees','ls_woocommerce_custom_surcharge' );
function ls_woocommerce_custom_surcharge() {
  global $woocommerce;
	if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return true;
	$minimumprice = 10;
	$currentprice = $woocommerce->cart->cart_contents_total;
	$additionalfee = $minimumprice - $currentprice;
	if($currentprice==0) $additionalfee = -1;
	
	if ( $additionalfee >= 0 ) {
		
		$woocommerce->cart->add_fee( 'Cart Value Adjustment', $additionalfee, true, '' );
		if(is_checkout())
		{
			$lsmin = wc_price( $minimumprice );
			$lscp = wc_price( $currentprice );
			wc_add_notice(
		    sprintf( 'Minimum Cart value is %s per order. As your current Cart only %s, an additional fee will be applied at checkout.' ,
		        $lsmin,
		        $lscp
		    ), 'success'
			);
		}
		else
		{
			wc_print_notice(
		    sprintf( 'Minimum Cart value is %s per order. As your current Cart only %s, an additional fee will be applied at checkout.' ,
		        wc_price( $minimumprice ),
		        wc_price( $currentprice )
		    ), 'error'
			);
		}
	}
}

Add Vat or Other Specific Charge as Additional Charge

add_action( 'woocommerce_cart_calculate_fees','ls_woocommerce_custom_surcharge' );
function ls_woocommerce_custom_surcharge() {
  global $woocommerce;
	if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return true;
	$percent = 18;
	$vatfees = ($woocommerce->cart->cart_contents_total * $percent ) / 100 ;
				
	if ( $vatfees >= 0 ) {
		
		$woocommerce->cart->add_fee( 'Vat', $vatfees, true, '' );
	}
}

Useful link
– Minimum order amount in Woocommerce
– Add a surcharge to cart and checkout – uses fees API

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