setting a negative shipping amount based on variables

7/30/2010 5:51 amsandy259886

I want to offer free shipping if a session variable = a certain value
AND
if there are more than 2 items in the shopping cart.

However, I also want to offer free shipping if a different session variable exists
AND there are more than 3 items in the shopping cart.

I don't think I can add all of these to my baserate and increment rate shipping . I'm thinking I need to have a different shipping method that sets a negative amount of shipping if these variables are met and that negative amount will calculate to zero.

My rate charged is based on a flat rate of : $_SESSION['BaseRate']

How do I make this amount ... $_SESSION['BaseRate'] ... a negative amount?

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setting a negative shipping amount based on variables

7/30/2010 5:51 amsandy259886