Spa pass upgrade?

[miztressuz]

We're going on the Wonder, first time on the ship so not sure how the spa will be. We have been buying the 1 day spa pass from the gifts section before boarding on previous cruises, but if we like the spa on the tour can we apply that day pass towards the cost of a week pass?

I thought I read a while back that you could, but I did a search on the forum and didn't get very many recent posts so wasn't sure if anything has changed.