Hack 34 Override Shipping and Handling Preferences 
Modify purchase buttons to override your
Profile settings, allowing you to set shipping and handling fees to
zero for digital goods.
Certain
goods, such as software or other
downloadable products, should not incur any shipping charges. By
default, PayPal calculates the applicable shipping fees and applies
them to every order. To configure your shipping calculation
preferences, log into PayPal, click Profile, and then click Shipping
Calculations.
The problem is that PayPal applies your shipping preferences to all
purchases placed through your PayPal buttons. If you sell both
tangible and digital products, you might need to charge different
shipping amounts for different products.
To override your shipping and handling preferences, turn on the
"Allow transaction-based shipping values to override
the profile shipping settings" options in your
Shipping Calculations profile page. Then,
add two additional variables to applicable buttons
and set each of them to zero (or any values you wish) for digital
goods purchases, like this:
<input type="hidden" name="shipping" value="0.00">
<input type="hidden" name="handling" value="0.00">
If you were to omit these two new variables, the shipping fees
applied to that product would default to the values in your PayPal
profile. You can add these two new form variables anywhere in your
button code, as long as they appear between the opening
<form> and closing
</form> tags.
When you override your Profile's Shipping
Preferences for a single item in your PayPal Shopping Cart, the
override applies only to that item. All other items are charged
shipping according to your Profile's Shipping
Preferences.
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