Startup Idea : Mobile recharge application for local vendors

In india around 40% of the prepaid mobile recharges are still done by local vendors. These vendors write down each persons number and the amount to recharge done. Whenever a customer comes to them with a complaint that the last recharge was not successful, then always have a hard time searching for the entry in the book to verify the customer. A solution is a app where the vendor only needs to select the recharge amount , mobile number and service provider and the app would automatically recharge the customers mobile with ease. The app can also be used to trace back unsuccessful recharges.