configuring product price as entered by user

Question

I am working on a website which provides an online option for mobile refill, Where customer can enter the amount to be recharged.

If we use simple product for it and use the custom option as text field, is it possible to change the amount of product as per the amount entered.

I tried to find the relative extension but was not able to get any. Is there any extension which fulfills such requirement ?

It would be great if anyone can guide me from where to start.

Thanks

Answer 1

The first thing that comes to mind is to make a product with price 1 (I hope you don't need possibility to specify cents). Then I'd hide the price and change the qty label to price.

This will require some other templates to be altered (cart, checkout review step, customers account) but at least no nifty core overrides are required.