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We need one custom field type in virtuemart 2, to charge at the total price of cart and not charge per product.
We have one custom field that increase price of item... if you buy 100 items will do (100*product price + 100*custom field price). we need to do (100*product price + custom field price)
like this website:
http://www.an-agapas.gr/eng/prosklisi/prosklitiria-gamoy/klasiko/modern-wedding-invitation (field: text printing)