SDK Initialization
To use UsherAccountSDK, you must first initialize it using the following method:
public static func initializeWith(configuration : UsherSDKConfiguration, completion: @escaping (NSError?) -> Void)
The UsherSDKConfiguration model class contains the params to pass to UsherSDK.
Example:
UsherSDK.initializeWith(configuration: config, completion: { error in
//do more thing
})