--- bak/class-wc-banklink-maksekeskus-redirect-gateway.php	2017-12-03 21:07:00.000000000 +0200
+++ class-wc-banklink-maksekeskus-redirect-gateway.php	2017-12-04 00:20:37.000000000 +0200
@@ -77,15 +77,33 @@
 		// Get the order
 		$order       = wc_get_order( $order_id );
 
+		// Construct return urls array
+		$return_url = array ( 
+			'url' => $this->get_option( 'return_url' ),
+			'method' => "POST"
+		);
+
+		$transaction_url = array (
+			'return_url' => $return_url,
+			'cancel_url' => $return_url,
+			'notification_url' => $return_url
+		);
+
 		// Request
 		$request     = array(
 			'shop'      => $this->get_option( 'shop_id' ),
 			'amount'    => round( $order->get_total(), 2 ),
 			'reference' => wc_estonian_gateways_get_order_id( $order ),
 			'country'   => wc_estonian_gateways_get_customer_billing_country( $order ),
-			'locale'    => $this->get_option( 'locale' )
+			'locale'    => $this->get_option( 'locale' ),
+			'transaction_url' => $transaction_url
 		);
 
+		// fix json_encode float precision bug in PHP 7.1
+		if (version_compare(phpversion(), '7.1', '>=')) {
+		    ini_set( 'serialize_precision', -1 );
+		}
+
 		// Generate MAC code
 		$mac_code    = $this->get_signature( $request );