How to add a program to run a daily task, at 2am everyday?

HI,
I'm working on a web application project which contains both web forms and MVC code. We are integrating with a payment processor, and I need to add a program to run daily at 2am, compile a list of customers to be charged and send their IDs to this payment processor, in an XML request; then get response back; then parse the response and handle accordingly.
I searched on this - some say use a "Web Service project", some say "database trigger". I'm not familiar with either, so I'd like to ask for some advice on this subject.
Also a factor to consider - I'm more familiar with using MVC/Razor, compared to web forms. However, the code that this daily program will interact with are all developed in web forms (.aspx and .aspx.cs); so will it be simpler if this new daily program is developed in web forms?
If the rote to go is the "web service" project - should it be  a Separate project under the overall solutio ...