Ecommerce Purchase

[jiayi1129]

Future<void> logEcommercePurchase ( {String currency, double value, String transactionId, double tax, double shipping, String coupon, String location, int numberOfNights, int numberOfRooms, int numberOfPassengers, String origin, String destination, String startDate, String endDate, String travelClass} )

How do I log the purchase of a single item using this API? I have been looking around for days and trying all sorts of things such as adding items to cart before logging the ecommerce purchase but it doesn't work. Do help!