When you use your KAF Digital Bank debit card at a self-service petrol pump, a temporary hold, known as a pre-authorisation, is placed on your account. This is a common practice at petrol stations in Malaysia to ensure that there are sufficient funds to cover the cost of your refuelling. 

A pre-authorisation amount, typically RM200, is temporarily held from your available balance. This allows the station to adjust the final charge based on the actual amount of petrol you pump. Once the transaction is completed, the pre-authorisation hold will be released, and the correct amount will be charged to your account.
The release of the pre-authorisation hold and the posting of the final transaction amount will be processed within a few business days.

If you prefer not to have a temporary hold on your funds, you can simply make your payment at the petrol station's counter or cashier before you refuel.