We implemented the Facebook Pixel with Shopify's official Facebook integration.On https://help.shopify.com/en/manual/promoting-marketing/analyze-marketing/facebook-pixel it states that the pixel should submit the net amount.
Unfortunately, this is not the case. It tracks the subtotal including taxes
Case:Customer buys one product for 59.90€ (19% VAT included)It should submit 50.34€It submits: 59.90€
I checked many Purchase events and compared them with the actual order.