Create Phone Reminder Service using API

I need a relatively simple reminder service built using the [login to view URL] API (web to phone service). Please take a look at Twilio before bidding on this project. Here is the feature list of the app that needs to be built: * User registration. User enters Phone number, Email and Name. * Set Reminders/Wake Up Calls. Users can create future reminders that will be phoned to them on the date and time they select. User can enter custom text. User needs to be able to edit and delete these calls. * Credit System. Every reminder is sent will cost the user 1 credit. Users will need to be able to purchase more credits via paypal. I will supply a design template that the app can be integrated into