Credit card surcharge for Direct debit (credit card) payments

Hi All,

I have a requirement to post a credit card surcharge for any direct debit (credit card) payments. The surcharge amount will be a % of the total outstanding amount for that payment run. I know additional line items can be posted through event 0032, and amounts can be modified through event 601. The requirement is:

a. Pick up the total outstanding amount for payment as per normal rules of FPY1

b. Calculate a particular % of the amount, post that amount as a surcharge on the account (debit), and send out the total amount + surcharge for payment

c. Clear the outstanding amount + surcharge immediately.

d. If payment is dishonored, then reverse the payment + surcharge (For this, I will need to create the surcharge document number and payment document number to be the same)

Can someone please help me with the relevant events where this can be done.

Thanks

Rajiv