// Products can be instrumented as an array of items that can be added to prescribed ecommerce events. 
 
//Measure a purchase by logging a purchase event with one or more items defined with the relevant fields.
 
// A pair of jeggings (product1)
Bundle itemJeggings = new Bundle();
itemJeggings.putString(FirebaseAnalytics.Param.ITEM_ID, "SKU_123");                     //Item ID (context-specific) (String). 
itemJeggings.putString(FirebaseAnalytics.Param.ITEM_NAME, "jeggings");                  //Item Name (context-specific) (String). 
itemJeggings.putString(FirebaseAnalytics.Param.ITEM_CATEGORY, "pants");                 //Item category (context-specific) (String).
itemJeggings.putString(FirebaseAnalytics.Param.ITEM_CATEGORY2, "sub-cat1");             //Item sub-category (context-specific) (String).
itemJeggings.putString(FirebaseAnalytics.Param.ITEM_CATEGORY3, "sub-cat2");             //Item sub-category (context-specific) (String).
itemJeggings.putString(FirebaseAnalytics.Param.ITEM_CATEGORY4, "sub-cat3");             //Item sub-category (context-specific) (String).
itemJeggings.putString(FirebaseAnalytics.Param.ITEM_CATEGORY5, "sub-cat4");             //Item sub-category (context-specific) (String).
itemJeggings.putString(FirebaseAnalytics.Param.ITEM_VARIANT, "black");                  //Item variant (String).
itemJeggings.putString(FirebaseAnalytics.Param.ITEM_BRAND, "Google");                   //Item brand. The parameter expects a string value
itemJeggings.putDouble(FirebaseAnalytics.Param.PRICE, 9.99);                            //Product price (double). Expecting a double value

// Prepare purchase params
Bundle purchaseParams = new Bundle();
purchaseParams.putString(FirebaseAnalytics.Param.TRANSACTION_ID, "T12345");				//The unique identifier of a transaction (String).
purchaseParams.putString(FirebaseAnalytics.Param.AFFILIATION, "Google Store");			//A product affiliation to designate a supplying company or brick and mortar store location (String).
purchaseParams.putString(FirebaseAnalytics.Param.CURRENCY, "USD");						//Currency of the purchase or items associated with the event, in 3-letter ISO_4217 format (String).
purchaseParams.putDouble(FirebaseAnalytics.Param.VALUE, 14.98);							//Value should be specified with BaseBundle.putLong(String, long) or BaseBundle.putDouble(String, double).
purchaseParams.putDouble(FirebaseAnalytics.Param.TAX, 2.58);							//Tax cost associated with a transaction (double).
purchaseParams.putDouble(FirebaseAnalytics.Param.SHIPPING, 5.34);						//Shipping cost associated with a transaction (double).
purchaseParams.putString(FirebaseAnalytics.Param.COUPON, "SUMMER_FUN");

// Add items
purchaseParams.putParcelableArray(FirebaseAnalytics.Param.ITEMS,
        new Parcelable[]{ itemJeggingsCart });

// Log purchase event
analytics.logEvent(FirebaseAnalytics.Event.PURCHASE, purchaseParams);