Q&A for How to Buy Books on Google Play

Simply go to Purchases in the Play Store. You will surely find it there, if you have purchased something, and you can download it again and change the destination zone to where you want it to be.

Electronic Funds Transfer (EFT) directly deposits your Google Play earnings into your bank account to speed up and simplify the payment process. EFT is fast, secure, and environmentally friendly, and it's the Google-recommended payment method. EFT deposits are made in the local currency of the bank account that you specify.

Technically, you are purchasing a licence to access the book that Google can revoke at any time. But most likely you will be able to keep the book as long as you download a copy to an offline device, and/or still have access to your Google Store account.

They will be around as long as the Google Play store is active. However, the licences will end if Google loses the right to distribute the book or removes it for some other reason (such as illegal content they only found after adding the book to the store).