In the Field edit section it indicated the following: You can use [FIELD_VALUE], [FORM_AMOUNT] and math operator : +, -, * , / to canculate fee value for this field. It only applied for textbox field type
However I have tried [FIELD_VALUE]+ [FORM_AMOUNT] and [FIELD_VALUE]- [FORM_AMOUNT] and that seems to work however when the client is directed to paypal the [FIELD_VALUE] seems to be added or subtracted again.
Example: client payment is 25.00 plus 2.50 fee payment forms will say total payment due 27.50 once directed to paypal the amount do is $30.00 which indicate that 2.50 is being added twice.
and
When [FIELD_VALUE]* [FORM_AMOUNT] and [FIELD_VALUE]/ [FORM_AMOUNT] is entered nothing at all happens.
can someone please tell me how to fix? Using Joomla 2.5 using Payment form Version 2.1
Thanks for some much needed help.
