Bill of Exchange

Can anyone clarify the parties to a BoE

The Open tuition text is unclear and contradicts the info provided by my Bank
Which states that the
The Drawer – Is the party that issues a Bill of Exchange – usually the seller.

The Drawee – Is the recipient of the Bill of Exchange – usually the buyer.

The Payee – Is the party to whom the Bill is payable; usually the seller or their bankers.

https://www.aibtradefinance.com/tf/frontBOEPage1.asp

This contradicts Page 54 of Open tuition notes and im totally confused