I've read so much conflicting information on this. Chase rep told me last week you could only get AF refunded if you cancel within 30 days of it posting. Another source says 30 days after the closing date of the statement where the AF posts. 60 days after closing date of statement if you're PC'ing.

Chase rep also told me in no case does anyone get a pro-rated refund on AF. A reddit post said that the pro-rated refunds are for CA residents only.

In my personal experience, I have gotten a full refund on CSP AF after PC'ing to Freedom 10 days after statement close date where AF posted, which was >30 days of the AF actually posting. I have never tried to get a pro-rated refund.