Overnight financing is a fee charged for holding a leveraged position overnight. It reflects the cost of borrowing funds to keep the trade open. It typically applies to positions without an expiry date (like CFDs), while futures typically include this cost in their pricing (via the spread).
The fee depends on the product you are trading and how long the position remains open.
Any applicable overnight fee will be displayed directly in the amana app before you place your order, so you can review it before confirming your trade.