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<a href="paypal-express-checkout" ><img src="images/btn_pay_with_paypal.png" width="179" height="36"></a>

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if(isset($_SESSION["cart_products"])) //Post Data received from product list page.
{
	//Other important variables like tax, shipping cost

	//we need 4 variables from product page Item Name, Item Price, Item Number and Item Quantity.
	//Please Note : People can manipulate hidden field amounts in form,
	//In practical world you must fetch actual price from database using item id. 
	//eg : $ItemPrice = $mysqli->query("SELECT item_price FROM products WHERE id = Product_Number");
	$paypal_data ='';
	$ItemTotalPrice = 0;
	$i = 0;
		foreach ($_SESSION["cart_products"] as $cart_itm)
        {
        $product_code 	= filter_var($cart_itm["product_code"], FILTER_SANITIZE_STRING); 
		
		$results = $mysqli->query("SELECT product_name, product_desc, price FROM products WHERE product_code='$product_code' LIMIT 1");
		$obj = $results->fetch_object();
		
        $paypal_data .= '&L_PAYMENTREQUEST_0_NAME'.$i.'='.urlencode($obj->product_name);
        $paypal_data .= '&L_PAYMENTREQUEST_0_NUMBER'.$i.'='.urlencode($cart_itm["product_code"]);
        $paypal_data .= '&L_PAYMENTREQUEST_0_AMT'.$i.'='.urlencode($obj->price);		
		$paypal_data .= '&L_PAYMENTREQUEST_0_QTY'.$i.'='. urlencode($cart_itm["product_qty"]);
        
		// item price X quantity
        $subtotal = ($obj->price*$cart_itm["product_qty"]);
		
        //total price
        $ItemTotalPrice = $ItemTotalPrice + $subtotal;
		
		//create items for session
		$paypal_product['items'][] = array('itm_name'=>$obj->product_name,
											'itm_price'=>$obj->price,
											'itm_code'=>$cart_itm["product_code"], 
											'itm_qty'=>$cart_itm["product_qty"]
											);
		$i++;
    }
	
	$total_tax = 0;	
	foreach($taxes as $key => $value){ //list and calculate all taxes in array
			$tax_amount     = round($ItemTotalPrice * ($value / 100));
			$tax_item[$key] = $tax_amount;
			$total_tax = $total_tax + $tax_amount; //total tax amount
	}
				
	//Grand total including all tax, insurance, shipping cost and discount
	$GrandTotal = ($ItemTotalPrice + $total_tax + $HandalingCost + $InsuranceCost + $shipping_cost + $ShippinDiscount);
	
								
	$paypal_product['assets'] = array('tax_total'=>$total_tax, 
								'handaling_cost'=>$HandalingCost, 
								'insurance_cost'=>$InsuranceCost,
								'shippin_discount'=>$ShippinDiscount,
								'shippin_cost'=>$shipping_cost,
								'grand_total'=>$GrandTotal);
	
	//create session array for later use
	$_SESSION["paypal_products"] = $paypal_product;
	
	//Parameters for SetExpressCheckout, which will be sent to PayPal
	$padata = 	'&METHOD=SetExpressCheckout'.
				'&RETURNURL='.urlencode($PayPalReturnURL ).
				'&CANCELURL='.urlencode($PayPalCancelURL).
				'&PAYMENTREQUEST_0_PAYMENTACTION='.urlencode("SALE").
				$paypal_data.				
				'&NOSHIPPING=0'. //set 1 to hide buyer's shipping address, in-case products that does not require shipping
				'&PAYMENTREQUEST_0_ITEMAMT='.urlencode($ItemTotalPrice).
				'&PAYMENTREQUEST_0_TAXAMT='.urlencode($total_tax).
				'&PAYMENTREQUEST_0_SHIPPINGAMT='.urlencode($shipping_cost).
				'&PAYMENTREQUEST_0_HANDLINGAMT='.urlencode($HandalingCost).
				'&PAYMENTREQUEST_0_SHIPDISCAMT='.urlencode($ShippinDiscount).
				'&PAYMENTREQUEST_0_INSURANCEAMT='.urlencode($InsuranceCost).
				'&PAYMENTREQUEST_0_AMT='.urlencode($GrandTotal).
				'&PAYMENTREQUEST_0_CURRENCYCODE='.urlencode($PayPalCurrencyCode).
				'&LOCALECODE=GB'. //PayPal pages to match the language on your website.
				'&LOGOIMG=https://www.sanwebe.com/wp-content/themes/sanwebe/img/logo.png'. //site logo
				'&CARTBORDERCOLOR=FFFFFF'. //border color of cart
				'&ALLOWNOTE=1';