Populating Variables

I'm adding a script to my order completion page, but I'm not sure what to fill in for the variables in NopCommerce. Any help?

_.order = "...order number goes here...";
_.subtotal = "...item subtotal goes here...";
_.currency = "...subtotal currency goes here...";
_.email = "...buyer email goes here...";

What version of nopCommerce?
In what .cshtml file are you trying to put the script?
What is it you're really trying to do? ;)

I guess you want to add script in checkout > completed.cshtml view page.
First you need to get order by id using OrderService and passed below variable like
_.order = "order.Id";
_.subtotal = "order.OrderSubtotalExclTax or order.OrderSubtotalInclTax"; // if you need to pass with tax then use order.OrderSubtotalInclTax
_.currency = "order.CustomerCurrencyCode"; //CustomerCurrencyCode is three letter e.g USD
_.email = "order.BillingAddress.Email";

I have a custom plugin that allows me to integrate script on any page that I need too so I won't be editing any of the .cshtml files. And I'm running on NopCommerce 3.80.

Thank you for the help! I'll see if these work.