public static partial class Nfc {
    // when a tag comes near
    public static event NfcTagEventHandler TagArrived;
    public static event NfcTagEventHandler TagDeparted;
    public static event NdefMessageReceivedEventHandler NdefMessageReceived;

    // basically enable/disable events
    public static bool IsListening { get; set; }

    // writing (not supported on iOS)
    public static void PublishMessage(string messageType, byte[] message);
    public static void StopPublishing();

    // helpers for writing NDEF tags (uses PublishMessage under the hood)
    public static void WriteTag(byte[] message);
    public static void ShareTag(byte[] message);
}

public delegate void NfcTagEventHandler(NfcTagEventArgs e);

public delegate void NdefMessageReceivedEventHandler(NdefMessageReceivedEventArgs e);

public class NfcTagEventArgs : EventArgs {
    public static new readonly NfcTagEventArgs Empty;
    public NfcTagEventArgs();
}

public class NdefMessageReceivedEventArgs : EventArgs {
    public NdefMessageReceivedEventArgs(byte[] message);
    public byte[] Message { get; }
}