<div><img style="position:absolute; visibility:hidden" src="https://www.ref-r.com/campaign/t1/settings?bid_e=XXXXamp;bid=YYYY&amp;t=420&amp;event=sale&amp;fname=#{order.customer.firstName}&amp;email=#{order.customer.email}&amp;orderID=#{order.id}&amp;purchaseValue=#{order.total}" /></div>