connect magento multiple adress shipping with payment gateway wit total order amount

I'm busy with my magento webshop with the multiple adres feature. Now i found out when using multiple adress after you place order it goes directly to succes page, magento makes for every adress 1 order. and that would cause the problem. you can't redirect to any payment gateway. I want it to redirect to payment gateway with total orderamount after order is placed in webshop, order should be 1 order and not 1 order per adres amount should also come in 1 invoice and not in two like magento does now. after payment it should land back on succes page. Because i am almost finished with website i need it done quick.