This job must be done immediately. I have a One Page Checkout form for a Payment Gateway that has ask for amount then service fee. I need it to to auto calculate 3.5% for the service fee and then add a total field after the math is done. The values of the original amount needs to remain UMamount and the Service fee field should remain UM02amount, so that the gateway recognizes the fields to process.
must be done asap. for $20