Conversation so far:
What was a major product endorsement ?
Ai has worked on four major Coca-Cola TV commercial campaigns.
did he have any big moves in his carrer?
Ai's most high-profile work for a TV drama was the theme song for 2006's primetime drama Team Medical Dragon.
did he only do song work?
Ai has featured as a spokesperson, or has her music featured, for many products.
did she ever sing with anyone else?
two featuring collaborations (K'naan's "Wavin' Flag" (2009), Namie Amuro's "Wonder Woman" (2011)).
who else did she do a calabo with in music?
CANNOTANSWER.

Question: what did she endorse for?
Self-contained rewrite: what did Ai (singer) endorse for?