Advice needed please? Payment options

[daffodil]

I have a client who has a store set up with 3 different customer groups - retail, trade and dropship.

She now wants the following to apply ONLY to apply to the TRADE group.

- payment made via Paypal to add 3% goods value onto order total
- payment made via Secpay to deduct 3% goods value from order total
- all ther payment types (cheque, trade credit) to remain 'normal'.

How on earth would I go about this when both paypal and secpay are available to all customer groups?

She also wants a selection of products to only be seen by the trade group (I have spied a contribution for this) - do you think this in addition will be a nightmare with the above?

[jpf]

Addition charge - nightmare yes! But discounted would be easier.

Could you do something like..?

Cash/cheque/on credit etc... - less 2.91% discount (work out to the old base cost)
Secpay - less 5.83% discount (works out to old base - 3% less)
Paypal - no discount.(old base cost/sell + 3 %)

I know the % looks silly but adding 3% then taking off 3% does not give you the SAME original amount.