The portal allows to you charge a fee based on the charges defined by you. If you not want to charge fee from a customer then navigate to Customers->Manage Customers page. Open desired customer in edit mode and select "Waive off Tchek fees" option. Fee is defined in slabs. Please create a ticket if you want to change the fee.
How chek charges are calculated?
When a chek is used then system receives used amount as a transaction. EFS/Comdata charges some fee from you on every chek transaction. This fee is usually less than the fee defined by you in Swiss Fuel portal. Portal compares fee applied by the EFS/Comdata with the fee defined by you and applies whichever is higher. Let's take an example. Assume your organization charges $5 as fee if check amount is between 0 and 1000. Let's assume EFS/Comdata charges $2.5 from you if chek amount is between 0 and 1000. If a chek for $50 is issued, then portal will add $5 as fee in the chek amount because your fee ($5) is higher than the fee ($2.5) charged by EFS/Comdata. In this case your organization is saving $2.5 on this chek. If EFS/Comdata charges $6 on same chek, then portal will add $6 into chek amount because EFS/Comdata charged higher fee ($6) than fee your fee ($5) . In this your organization's saving is zero. Saying this means fee is not applied on top of what is charged by EFS/Comdata from your organization.
You can choose whether to apply fee on top of chek amount or to deduct from the total amount. To apply on top of chek amount turn on 'Exclude Transaction Fees' in manage customers page. If 'Exclude Transaction Fees' is on, then customer will receive full chek amount but will be invoiced as chek amount plus fee. For example if chek is issued for $50, then customer will receive $50 as cash but will be invoiced for $55. If 'Exclude Transaction Fees' is off then customer will receive cash after deducting fee. For example if chek of $50 is issued then customer will receive $45 only, but will be invoiced for $50. If you do not see 'Exclude Transaction Fees' option in manage customers page then this feature is not on for you. Please create a ticket to get this feature.