Barcode Reader & Calculator

I need an app that will use the phone's camera to scan a barcode, record the price of that barcode and total up the amounts for a store. The app would have to allow me to scan in various barcodes for items in my store, and also allow me to set the price of each item. I would probably have to set the prices up in advance, so if web hosting is required for this, I could provide that. I want to be able to just use my android phone for processing purchases at my store. I have a [login to view URL] account for processing the credit cards, but you have to use an iPad and additional bar code scanning equipment to add up all of the purchases with [login to view URL] When people come to the register with a basket full of items, I want the app to scan the barcode of each item and keep a running total of the cost of the items purchased and display the total as items are added. I can then take that total and plug it into the square app to process the purchase. No credit card processing will be required for this app. This app must simply: 1) scan the barcode 2) add the item cost to the total 3) display the total I have attached a list of barcodes that I received last year for our products as a sample. This will change for 2015, so I need a way to update it every year. I also want to make this app available to other businesses, so there should be a way for each user to add info for each barcode they will be using. Deliverables You will receive payments when: 1) I have tested the app and it performs all functions required correctly 2) I have received the source code for the app 3) I have successfully uploaded the app onto the Google Playstore