Based on the same post,
I tried this (which I know is putting PHP inside of Javascript, but I'm unsure what else to do here...):
<!-- SpringMetrics Conversion Code for mattressinsider -->
<script type="text/javascript">
_springMetq.push(["setdata", {literal}{revenue: "{/literal}if (<? echo $order.total ?>) {<? echo $order.total ?>;}{literal}"}]);
_springMetq.push(["setdata", { "orderId": "{/literal}{$order.orderid}{literal}" }]);
_springMetq.push(["setdata", { "email": "{/literal}{$order.email}{literal}" }]);
_springMetq.push(["setdata", { "promoCode": "{/literal}{$order.coupon}{literal}" }{/literal}]);
_springMetq.push(["convert", "sale" ]);
</script>
<!-- SpringMetrics Conversion Code for mattressinsider -->
Which output this:
<!-- SpringMetrics Conversion Code for mattressinsider --> <script type="
text/javascript"> _springMetq.push(["setdata", {revenue: "if (<? echo $order.total ?>) "}]); _springMetq.push(["setdata", { "orderId": "" }]); _springMetq.push(["setdata", { "email": "" }]); _springMetq.push(["setdata", { "promoCode": "" }]); _springMetq.push(["convert", "sale" ]); </script> <!-- SpringMetrics Conversion Code for mattressinsider -->
I also tried this:
<!-- SpringMetrics Conversion Code for mattressinsider -->
<script type="text/javascript">
_springMetq.push(["setdata", {literal}{revenue: "{/literal}{<? echo $order.total ?>;}{literal}"}]);
_springMetq.push(["setdata", { "orderId": "{/literal}{$order.orderid}{literal}" }]);
_springMetq.push(["setdata", { "email": "{/literal}{$order.email}{literal}" }]);
_springMetq.push(["setdata", { "promoCode": "{/literal}{$order.coupon}{literal}" }{/literal}]);
_springMetq.push(["convert", "sale" ]);
</script>
<!-- SpringMetrics Conversion Code for mattressinsider -->
Which output this:
<!-- SpringMetrics Conversion Code for mattressinsider --> <script type="
text/javascript"> _springMetq.push(["setdata", {revenue: ""}]); _springMetq.push(["setdata", { "orderId": "" }]); _springMetq.push(["setdata", { "email": "" }]); _springMetq.push(["setdata", { "promoCode": "" }]); _springMetq.push(["convert", "sale" ]); </script> <!-- SpringMetrics Conversion Code for mattressinsider -->