How to add refactoring to a language service?

Hi all,

I am developping in C# a language service. For now, I have managed to add syntax colorization, intellisense... I would like to know if it is possible to get the same refactoring as in C#? I am only interested in implementing the rename function.
If it is, would you know which interfaces need to be implemented to get this feature?

Thanks for reading my message.