I don't have the app, but I added my library card to my Apple Wallet and just scan that to check out.

I don’t have the app, but if someone else is picking up a book for me I give them my card number and they manually enter it at the check-out machine.

Up until a week ago I could use my phone to checkout books from MCPL. This was great if I was in a hurry or knew a neighbor/friend was heading to the library and I had books on hold. But now I don't see the option to check out books with the app. Did this change? Is it just my app?