I can confirm this is fine. I booked/paid for my cruise 2 months ago. Then read about the OBC and decided to get some shares when it was below $9 using Robinhood (already had an account for crypto failures, so was easy to use!) After a month went buy and I got my monthly statement I took screen shots of the 2 pages, blanked out my account number, and put them in a Word document. Emailed to their shareholder address on the 10th of the month, got the OBC added the next day to my booking!
Super simple process overall.
