I want to create Service Marketplace.

I want to create a service marketplace. The reference site is as follows. - [login to view URL] - [login to view URL] The WordPress jobster theme is similar to what I want. However, the jobster theme seems to have a lot of problems (bugs). I want to based on php. The desired function is as follows. 1) Service registration Service registration is available only seller. And only managers approved services are available for sale. 2) Payment system (paypal) 3) Transaction process A. The buyer purchases (makes a payment) the seller's services. B. Seller provides the service to the buyer. C. when buyer confirms, buyer can complete the transaction. If service is not OK, can request the service again. D. After between buyer and seller completes the transaction, 80% of the transaction amount will be seller's point. (20% is commission) 4) Settlement system We will get 20% commission on the transaction amount. If the seller has more than a certain amount of cash ($ 100), the seller can ask for a cash refund. so i need a function that cash refund request and settlement list. 5) Message system All transactions are in real time message. All of the above are similar to the jobster theme. But the theme have many problem. If you can easily build, please contact me.