Wikipedia page about this book: https://en.wikipedia.org/wiki/Down_and_Out_in_the_Magic_Kingdom

Release date is 2005-05-01

"Down and Out in the Magic Kingdom" by Cory Doctorow is a science fiction novel published in 2003. Set in a 22nd-century post-scarcity world, the story unfolds at Walt Disney World, where rival groups compete for control of attractions and visitors' esteem through a reputation-based currency called Whuffie. When narrator Julius is murdered and suspects foul play, he battles to preserve traditional park experiences against technological change, risking everything he values—including his relationships and his very identity. (This is an automatically generated summary.)

Original publication data not identified