I am working with a law firm who may potentially subscribe to Zoho One.  The main concern is the use of Zoho Books and processing retainer fees from clients.

The EXACT amount of the retainer needs to be deposited into a trust account. 

For example.  If someone pays a retainer using a credit card of $2,500.00.   $2,500.00 needs to be deposited into the trust account.  The credit card processing fees needs to be paid using an operating account.  The deposit cannot be the $2,500.00 minus credit card processing fees.

Is there a way to ensure that the credit card fees are paid separately using a different bank account like an operating account to pay for those types of fees instead of it being a part of the processed deposit going directly into the trust account?