async Task ExecuteBecomeCashPointCommand()
{
var location = await Geolocation.GetLastKnownLocationAsync();
MyLat = location.Latitude;
MyLong = location.Longitude;
BigInteger latitude = Nethereum.Util.UnitConversion.Convert.ToWei(MyLat);
BigInteger longitude = Nethereum.Util.UnitConversion.Convert.ToWei(MyLong);
var result = await accountsManager.BecomeCashPointAsync(DefaultAccountAddress, CashPointName, latitude, longitude, Phone, Rate, 2);
await navService.DisplayAlert("Send Result", $"tx:{result}", "ok", "cancel");
}