Helium by Chartboost SDK integration

[NSNotificationCenter.defaultCenter addObserverForName:kHeliumDidReceiveILRDNotification
                                                object:nil
                                                 queue:nil
                                            usingBlock:^(NSNotification * _Nonnull notification) {
    // extract the ILRD payload
    HeliumImpressionData *ilrd = (HeliumImpressionData *)notification.object;
    NSDictionary *json = ilrd.jsonData;
    // mandatory fields
    NSNumber *ad_revenue = [json objectForKey:@"ad_revenue"];
    NSString *currency_type = [json objectForKey:@"currency_type"];
    ADJAdRevenue *adRevenue = [[ADJAdRevenue alloc]
                              initWithSource:@"helium_chartboost_sdk"];
    [adjustAdRevenue setRevenue:[ad_revenue doubleValue] currency:currency_type];
    // optional fields
    NSString *network_name = [json objectForKey:@"network_name"];     // Helium demand network name
    NSString *placement_name = [json objectForKey:@"placement_name"]; // Helium placement name
    NSString *line_item_name = [json objectForKey:@"line_item_name"]; // Helium line item name
    [adjustAdRevenue setAdRevenueNetwork:network_name];
    [adjustAdRevenue setAdRevenueUnit:placement_name];
    [adjustAdRevenue setAdRevenuePlacement:line_item_name];
    // Send Adjust ad revenue
    [Adjust trackAdRevenue:adjustAdRevenue];
}