GA4 - iOS - Swift - purchase

// 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)
var jeggings: [String: Any] = [
  AnalyticsParameterItemID: "SKU_123",                      //Item ID (context-specific) (NSString).
  AnalyticsParameterItemName: "jeggings",                   //Item Name (context-specific) (NSString).
  AnalyticsParameterItemCategory: "pants",                  //Item category (context-specific) (NSString).
  AnalyticsParameterItemCategory2: "sub-cat1",              //Item sub-category (context-specific) (NSString).
  AnalyticsParameterItemCategory3: "sub-cat2",              //Item sub-category (context-specific) (NSString).
  AnalyticsParameterItemCategory4: "sub-cat3",              //Item sub-category (context-specific) (NSString).
  AnalyticsParameterItemCategory5: "sub-cat4",              //Item sub-category (context-specific) (NSString).
  AnalyticsParameterItemVariant: "black",                   //Item variant (NSString).
  AnalyticsParameterItemBrand: "Google",                    //Item brand(NSString).
  AnalyticsParameterPrice: 9.99,                            //Product price (double as NSNumber).
]
// Prepare purchase params
var purchaseParams: [String: Any] = [
  AnalyticsParameterTransactionID: "T12345",                //The unique identifier of a transaction (NSString).
  AnalyticsParameterAffiliation: "Google Store",            //Optional. A product affiliation to designate a supplying company or brick and mortar store location (NSString).
  AnalyticsParameterCurrency: "USD",                        //Currency of the purchase or items associated with the event, in 3-letter ISO_4217 format (NSString).
  AnalyticsParameterValue: 14.98,                           //Value should be specified as signed 64-bit integer or double as NSNumber.
  AnalyticsParameterTax: 2.58,                              //Tax cost associated with a transaction (double as NSNumber).


  AnalyticsParameterShipping: 5.34,                         //Shipping cost associated with a transaction (double as NSNumber).


  AnalyticsParameterCoupon: "SUMMER_FUN"
]

// Add items
purchaseParams[AnalyticsParameterItems] = [jeggings]

// Log purchase event
Analytics.logEvent(AnalyticsEventPurchase, parameters: purchaseParams)