I agree it's best to contact your Account Manager and open a support ticket for this. I've included some sample code below.
// Javascript Extension scoped to your Test and Target tag
// Assumes your data layer (aka utag_data) has "conversion_id" and "conversion_value"
// Assumes that conversion_id is only set on the conversion page
if(b.conversion_id){
mboxDefine('conversionPage','conversionPage',
'conversionId='+b.conversion_id,
'conversionValue='+b.conversion_value);
mboxUpdate('conversionPage',
'conversionId='+b.conversion_id,
'conversionValue='+b.conversion_value);
}
// Here is the existing code that fires automatically in the template for an E-commerce order event
if(b._corder){
mboxDefine('orderConfirmPage','orderConfirmPage',
'productPurchasedId='+b._cprod.join(','),
'orderId='+b._corder,
'orderTotal='+b._ctotal);
mboxUpdate('orderConfirmPage',
'productPurchasedId='+b._cprod.join(','),
'orderId='+b._corder,
'orderTotal='+b._ctotal);
}