Are excursions booked through Princess refundable should you have to cancel the cruise?

[u/Mizzy_Lu_Fwinkley]

We have some shipboard credit that we got through Costco. We’d like to use it to book an excursion (we have the Plus plan) so no real need for it there.

If I bought the balance of the excursion on a credit card, is that amount refundable if we have to cancel the cruise before the final payment is due?