Usead auto parts

I need an Android application that would work as a broker in sales. Sellers would register in the application. When registering, they would mark the sales field (type A, B, C, D ... ..) Customers on the other would have asked for the purchase of type A, B, C, D ... under the search a, b, c, d .... by typing the textual description and the possibility of sending photographs to sellers. Once the buyer completes the request, the same is forwarded to all sellers who have registered for the sale of a particular type. Depending on whether they have goods of this type, through the application, the sellers respond with (a photo and a description of what they offer to both a single or a collective price). Offers of all sellers are sent to the buyer. If the purchase ends successfully, the customer will send his information to the specified seller for the delivery of a purchase item. At the same time, the seller is responsible for the sale in a percentage of 3%.