How can Request Validation be disabled for HttpHandlers?

Question

Is it possible to disable request validation for HttpHandlers?

A bit of background - I\'ve got an ASP.NET web application using an HttpHandler to receive the payment

Answer 1

For IIS7 we've been adding/modifying the following key in web.config

see http://www.asp.net/learn/whitepapers/aspnet4/breaking-changes#0.1__Toc256770147