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Rules for the order pages

Rule for the shopping cart: This rule is carried out before all others. Own
calculation code (valid PHP source code!) for the shopping cart.

Second rule for the shopping cart: This rule is carried out after the
calculation of the shopping cart contents. Own calculation code (valid PHP source
code!) for the shopping cart.

Rule for the first order page (shipping/payment method): Own calculation
code (valid PHP source code!) for the first order stage.

Rule for the second order page (invoice and shipping address): Own
calculation code (valid PHP source code!) for the second order stage.

Rule for the final order page (display order confirmation): Own calculation
code (valid PHP source code!) for the final order stage.