Hi Matty, Yeah, the automatic postage parameters on paypalUK are illogical when UK postage is (I assume almost exclusively) based upon the weight of the item. Like you, I'm pretty reluctant to go down the 3rd party route due to complexity and time. At the moment I'm thinking of using the 'shipping' and 'shipping2' variables on my 'add to cart' buttons, thereby giving every item a fixed postage and additional postage cost on multiple purchases of the same item. It is a far from ideal solution but, other than the unfavourable third party option, I'm not sure what else to do.
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