iBeacon app developer

I need an iphone app. Its more about modify thgis app because I have a sample but we have to add new features. At the moment the app sends you a notification when you are at the beacon zone and sends you another when you leave. We need to add this features: When you arrive to the store and shows you notification, you open that notification and you will see a image (discount coupon or some info about the store) When you leave the store it sends you a good bye notification, then in you open the app maybe you could see a sujrvey about the shop. Also we need to register how many times a customer come backs to the store, and all the data you think we can get from the app We are intended this for shopping center, so the app will let the user choose wich notification from wich stores he wants to receive. At the moment we will send just coupons or some little image to the user, no products at the database or something like that, just a picture with info from a website. Finally we also want user location based on ibeacon triangulation, so we can know the most visited areas from a store. You can understand more if you watch from second 30 thsi video [login to view URL] Please just offer if you have worked with this, because my budget is very low like 500 usd... I will be waiting for your budget Here is a sample app and sdk [login to view URL] So it would be really easy for you