@joostvandevijver , We are facing same issue on our site after moving to this plugin. I have checked logs and found {"field":"/purchase_units/@reference_id=='default'/shipping/address","issue":"MISSING_SHIPPING_ADDRESS","description":"The shipping address is required when
shipping_preference=SET_PROVIDED_ADDRESS."}
but in shipping address is already in request parameters.
We are using 1.6.1 version. Please help us, as it creates issue for our valuable cutomers