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Security settings for shopping cart integration.

Use secure shopping cart integration: Secure shopping cart integration
prevents your shop from customers placing products with random attributes (item
numbers, prices etc.) in the shopping cart by asking for a check sum when the order
script is called up. You then have to use Secure shopping cart integration to
generate a check sum for every item that you want to make available.

Code for secure shopping cart integration: The value in this field is used
as a 'password' and included in the calculation of the check sum. NOTE: If you
change this entry, you will have to recalculate the check sum for every item.

Deactivate secure shopping cart integration: Select this option to correct
the error 'Invalid item'. Check sums will then neither be created nor checked in
the shop. NOTE: This setting overwrites the setting Use secure shopping cart