Character XP Rates

Good Evening,
I am currently in the process of learning how Trinity Core's scripting/plugin side works.
What i am currently confused on is what is the best way to change an accounts xp rate?
I did find 2 old scripts that did this but they are a tad old and the download links are currently dead.

Check this thread
the link of C++ patch is updated on it

http://www.mmopro.org/c-scripts-and-...re-3-3-5a.html

Ah sweet bud, did find the old posts of that with the broken link.
Will check it out.