Just like Cinderella, the deadline is at midnight.

June 20, 2017

If you have an Apple eBook credit coming from Amazon’s online book store, you have four days to cash in.

A year ago, when the U.S. Supreme Court refused to hear its appeal of a class action suit, Apple aapl was ordered to offer $400 million in refunds to people who bought specified e-books between April 1, 2010 and May 21, 2012.

Related: Apple Presses Supreme Court Over eBook Suit

The aggregate refund of $400 million was issued via credits to people who bought books via Amazon, Barnes & Noble, Kobo, and Apple’s iTunes.
The deadline to cash in on the credit from Amazon is June 24, 2017 at 11:59 p.m. PT.

Related: Apple’s $400M E-Book Payout: How Much You’ll Get and When

Book buyers should have been notified about their credits via email. To check on whether are due some money, log into your Amazon amzn account and check this page to see if they have credit coming.

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If you care about the nitty-gritty, attorneys general from 33 states plus other plaintiffs claimed Apple and five publishers—Hachette, HarperCollins, MacMillan, Penguin, and Simon & Schuster—conspired to fix and inflate the retail prices of e-books, according to a website outlining the lawsuit and settlement,

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