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setting a negative shipping amount based on variables

Thread began 7/30/2010 8:51 am by sandy259886 | Last modified 7/30/2010 12:54 pm by CraigR | 646 views | 5 replies |

sandy259886

setting a negative shipping amount based on variables

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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CraigRBeta Tester

would it not be easier to set this up as a discount if the criteria are met. so that the level of discount matches the shipping cost.

in your cart display, the shipping would still be shown , but the 'free shipping' discount would also be shown, with the cart subtotal calculated correctly

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sandy259886

the increment?

My shipping is set to "baserate" for the first item and "incrementrate" for each additional item ... How could I do that for the incremental rate?

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CraigRBeta Tester

can you show me the shipping calculations you have set up for baserate and increment rate ?

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sandy259886

shipping calculation

2 Calculations for shipping:

1) Baserate
if TotalWeight >0
calculation: Flat Rate = $_SESSION['Baserate']

2) Increment
if TotalWeight > 1
calculation: Total Weight times $_SESSION['Increment']
minus $_SESSION['Increment']

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CraigRBeta Tester

try putting the exact same calculations in the discounts tab of the ecart object, they should calculate the same, but as negative values, thus cancelling the shipping

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