A Microsoft framework for building cross-platform mobile apps using .NET and C# with native performance and user interfaces.
Use a tuple, or try defining a class for your data. For example:
class MyData
{
public string Email;
public int Token;
}
. . .
var d = new MyData { Email = email_address, Token = token_number };
MessagingCenter.Send(this, App.ShowPINActivation, d);
Show details if you cannot read these data in callbacks.