Android apk development of POS system

I need android app developer to do my POS have my need features. Don't bid high price very far from $50. I can discuss for more clarification I attached some screenshot Mobile Application Name: Gotera POS Sales and store management (POS) – offline android application. Purpose - I have a built in application. attached here However, it has the same additional features to make it work klotin. Start - Add users o Admin, Casher, buyer. Admin- owner manage everything. Casher- some right limited. Casher – enable/ disable make add edit delete product, purchase. Buyer – order product. Admin, Casher Password protected - Add product - Product Name, category, image - Edit & delete Product - Add Purchase o Cost, Price, Quantity Cost & Price – refer previous cost o Search item, qr search item. Purchase lot – single or dozen - Order Product. - Clicking add to cart Max click is quantity of product o Search Item, qr search item o Order lot – single or dozen o Sales credit – recorded buyer name - Cart o Calculate ordered product o Adjust sales price and quantity o Delete or zero quantity auto remove - Setting o Company Name, currency change, password change o User right assign - Expense recorded o Add, edit, delete expense - Report o Report sales o Report sales detail o Report Credit sales o Report Purchase o Report Purchase Detail o Report expense o Report Profit o Report Inventory o Sort view daily, weekly, monthly and from –to o Calculate inventory * cost = Asset value. - Export o Export to report to PDF o Export Product only to restore other device o Export everything and restore other device o Sync google drive - View o Grid view (4 item) / list view o Order page click add to cart - Network share o Send order item using qr to casher o Casher Scan qr buyer order o Sync local network multiple app if possible - App store features o Free package add product and purchase 15 item o Pro unlimited features – api key periodic check