Register the Callback

After implementing the callback, you register the object implementing the protocol method in the initialization code as shown below. When the iOS Agent is ready to create a network request beacon, it will first call the callback with an ADEumHTTPRequestTracker object.
Objective-C
CODE 
ADEumAgentConfiguration *config = [[ADEumAgentConfiguration alloc] initWithAppKey: <#EUM_APP_KEY#>];
config.networkRequestCallback = self;
[ADEumInstrumentation initWithConfiguration:config];
Swift
JAVASCRIPT 
let config = ADEumAgentConfiguration(appKey: <#EUM_APP_KEY#>)
config.networkRequestCallback = self
ADEumInstrumentation.initWith(config)