The linkpoint files should already be included with the default distribution of the cart.
The shipping charges are handled in the shipping manager. You will probably need to use custom shipping logic if you are outside of the US. If you are in the US, you will need custom shipping for international shipments. Shipping calcualtions is not handled by the order form, it only specifies the shipping method for the shipping calculations.
HTH!~
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God Bless!
Bonnie - AgoraCart Moderator
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