Linnworks takes the "original_price" as already tax inclusive and makes a subtotal out of it (minuses the 20% automatically). This means that if your store uses discount codes or loyalty point modifications, the total imported into Linnworks is different from the amount in your store.
This results in the customer receiving a purchase invoice from your store and your payment provider with one total, but then a different total sent out from Linnworks with their despatch email and paper invoice.
I have raised this with support, and it cannot be resolved .It also cannot be corrected using the 'Use Adjustment' feature in Linnworks.
This needs fixing, as it also means no accounts packages can be connected to Linnworks, as they will be incorrect