know your website users

void postCommerceAddItem(String productName, String productId, String nameSpace, double unitPrice, int quantity)
void postCommerceAddItem(String productName, String productId, String nameSpace, double unitPrice, int quantity, Map<String, Object> properties)

Example of its use - buy 1 Babelfish (item number 42) for the price of 10 currency:

NMTracker.postCommerceAddItem("Babelfish", "42", "http://myandroidapp.company.com", 10, 1);