Build an Online Store

Here is what needs to be done -Create offers/ads. When you have basic flow of users bitcoin wallets in hand, it's time to move into marketplace part. First part is the offer creation. What are the rules here like hard-coded payment methods (we went step further and allow users to dynamically create new payment methods), payment window time, BTC price margin, offer visiblity to users? etc etc... Additionally have all the CRUD (create,read,update,delete) operations for the offer and all the business logic like updating price every 10 minutes, activation, deactivation etc... Now comes the trading part - start trade, mark trade as paid, complete trade, auto-cancel trade, cancel trade by user, dispute trade, leave feedback. For all these trade actions the business logic has to be extremely well thought through and code written well with all edge cases taken into account. Otherwise you can end up with adding balance twice, deleting accidently records or simply break database schema. Feedback system is another part. Would you make it different? How complex would that be then? We have different feedback approach - feedback can be left for every completed trade and also a reply can be left. In case dispute a loser can't leave feedback. Reporting capabilities for any historical data/actions - users completed trades, activity ledger, transactions ledger, generated bitcoin addresses and any other historical data you need to output.