I have both a Premier and a Business account registered in the app. Will my personal receipts be stored in my business account?

Receipts will be stored separately for your Premier and business accounts.

You'll need to register and create a separate receipts password for your Premier and business accounts. Any receipts captured will be stored against the associated account. If you have captured a receipt against a wrong account, you'll need to delete and recapture the receipt against the correct account.