RCTGoogleAnalyticsBridge.m

RCT_EXPORT_METHOD(sendEcommerceCheckoutStep:(NSString *)trackerId step:(nonnull NSNumber *)step products:(NSArray *)products)
{
    id<GAITracker> tracker = [[GAI sharedInstance] trackerWithTrackingId:trackerId];
    
    GAIDictionaryBuilder *builder = [GAIDictionaryBuilder createEventWithCategory:@"Ecommerce"
                                                                           action:@"Checkout"
                                                                            label:nil
                                                                            value:nil];
    
    GAIEcommerceProductAction *action = [[GAIEcommerceProductAction alloc] init];
    [action setAction:kGAIPACheckout];
    [action setCheckoutStep:step];
    for(NSDictionary* reactProduct in products) {
        GAIEcommerceProduct *product = [[GAIEcommerceProduct alloc] init];
        [product setId:reactProduct[@"item_id"]];
        [product setName:reactProduct[@"name"]];
        [product setPrice:reactProduct[@"price"]];
        [product setQuantity:reactProduct[@"qty"]];
        [builder addProduct:product];
    }
    [builder setProductAction:action];
    [tracker send:[builder build]];

}