Hi 02Martin, the button on the merchant website calls PayPal to process the payment and is passing to PayPal specific variables like amount, discount, etc.. So PayPal processes what the website sends to process. Usually in the scenario you mentioned the button is passing a different value than the one on the website (plugin in error or simply the amount incorrectly calculated by the website). I would suggest to contact that website/merchant and point this out with them. In case they see this for all their items they can eventually contact the PayPal Technical support to understand better that behavior. Thanks.
