We use the micro payments add on for Woocommerce. We have recently changed the way we handle shipping charges on our site so they are charged according to the weight of the items. This seems to be causing the micro payments plugin a problem. If the items are under our set level of £9.50 but the shipping pushes the price over £9.50 the orders remain on hold due to “Validation error: PayPal IPN response from a different email address” This only occurs when the shipping causes the basket value to exceed the £9.50.