I have a demand of creating a reconcilation model to deduct a fixed charge for every transaction as bank fees. For example if the customer pays 100 coins, 2 coins (fixed charge) should be deducted for bank fees for every transaction, and only 98 coins is only considered.

Similarly if I want to pay to my vendor 100 coins, 2 coins (fixed charge) is deducted for bank fees, and only 98 is given to the supplier.

How to set this reconcilation model in odoo with the correct accounts?