I want to, build a order systems for exist project. Order systems must control location for market and take payment method from user. And then if order is successful, it must send email to market personel. This project is really easy, but maybe order a bit difficult at the multi-cart. In website users can be add cart products in different seller. If you have received the market basket of products is below the minimum order amount, order can not turn. But the minimum order amount of different markets and shopping can be passed separately at this stage, the user must give opportunity to convert cart to order. The minimum order amount in the system and send every one market can have space limitations. Markets differently for each region will send a minimum amount must be able to determine. Perhaps the most difficult part is where.