Write an iPhone application

Need app for tipping staff of hotels & supermarket. It should be seen as an add-on request/services app. Similar features to [login to view URL] User (tipper): sign in/create billing profile --> request* ---> pay/tip (money retained by the app until task is complete) ---> receive Tip receiver: select request ---> deliver ---> release tip (*) Request involves choosing request then providing details if necessary. ---- // -------------------------------- sample -----------------------// --------------------- Items with 'D' require further explanation**. 'Q' means specify Quantity. 'T' means free of charge, tip suggested. (**)Those with D should have a space to provide more details or a following screen for input. ----- // ---------------------- Request (page sample): ------------------------------- Page 1, make selection by imputing a number (dollar value) Most Popular [ } tip (other) - D [ 5 ] groceries bagger [ ] room service/house cleaning [ ] transportation Quick-tips [ ] groceries bagger [ ] ice [ ] room service/house cleaning [ ] closet organization [ ] luggage prep [ ] dry-clean - Q, D [ ] toothbrush - Q [ ] toothpaste [ ] airport pick-up [ ] airport drop-off [ ] transportation [ ] food delivery - D [ ] additional towels - Q [ ] personal trainer { } groceries shopping (PROCEED BUTTON) ! --> message pop-up (confirmation) "You have chose to tip $5 to groceries bagger" -->(EDIT DOLLAR AMOUNT) (CANCEL) (OK) > After pressing OK ==> please input tip receiver email-address or phone number: ! --> 2nd message pop-up (confirmation) "You have chose to tip $5 to groceries bagger 5% transaction fee will be added for a total charge of $5.25" -->(EDIT DOLLAR AMOUNT) (EDIT RECEIVER INFO) (CANCEL) (OK) > After pressing OK ==== "transaction completed, thank you" ====