send coupon code server side to be applied to users subscription

services/web/app/coffee/Features/Subscription/RecurlyWrapper.coffee

@@ -13,6 +13,7 @@ module.exports = RecurlyWrapper =
 		          <subscription>
 		            <plan_code>#{subscriptionDetails.plan_code}</plan_code>
 		            <currency>#{subscriptionDetails.currencyCode}</currency>
+		            <coupon_code>#{subscriptionDetails.coupon_code}</coupon_code>
 		            <account>
 		            	<account_code>#{user._id}</account_code>
 		            	<email>#{user.email}</email>

services/web/public/coffee/main/new-subscription.coffee

@@ -101,6 +101,7 @@ define [
 					subscriptionDetails:
 						currencyCode:pricing.items.currency
 						plan_code:pricing.items.plan.code
+						coupon_code:pricing.items?.coupon?.code || ""
 				$http.post("/user/subscription/create", postData)
 					.success (data, status, headers)->
 						window.location.href = "/user/subscription/thank-you"