Retail Repair POS system

Hello, I am looking for a POS system customized to my needs. We are looking to develope a software that is for t i need a cloud-based P.O.S. system designed specifically for the unique and complex needs of the your mobile phone and device repair business. i need thewebsite to be user firendly, while adding additional and customized features that are specifically useful to cell phone and mobile device repair businesses. From customized reports, to tracking of inventory, to keeping customer information straight and organized. I like the look of this site : [login to view URL] But, i need the functionalists of [login to view URL] I need 100% the functions of visivity, but i need it to be super user friendly, and picture oriented to functions and objects. I need the website to have these main criteria.. 1. Accounting of each store or company 2. POS to ring out sales 3. 50 Different reporting functions (from daily sales, to commision) Lots of available reports to track items, customers, employees and more. 4. API link to vendors to auto order on a weekly basis. 5. Sub-logings for each employee with controlled fuctionaliest by the admin or master account. 6. compatible with multiple devices, ipad macbook, iphone, and desktop. 7. muti-store control 8/ Process Credit Cards 9. Simple to use sales interface, requires very little training for employees. Start processing sales in minutes. 10. Items can be added quickly via the items module or imported via a .csv file. You can also optionally receive e-mail alerts when inventory is low. 11. Setup basic store information including name, address, and tax information. 12. customers can easily pay with any method they want, even more than one. 13. MUST HAVE INVENTORY MANAGEMENT. WITH SERIAL NUMBERS 14. Be able to process Returns 15. Have a buy back program as well so the customer can sell goods back to the store. 16. It must be a website that i can charge customers to sign-up and use the software and they pay a monthly fee. if they dont pay i can freeze their account. Please let me know what are the websites you have developed before, for POS systems. I don't mind you using a pre-designed backbone that you have already made, but then customized for my needs. Please no copyright stuff. So if you have a premade back bonse structure please make sure it is opensource or your own developed.