private async void Button_Clicked_AddAccount(object sender, EventArgs e)
        {
            BankAccount accountToAdd = new BankAccount();

            accountToAdd.accountName   = AccName.Text;
            accountToAdd.accountNumber = AccNum.Text;
            accountToAdd.accountOwner  = sessionUser.phoneNo;
            accountToAdd.iban          = iban.Text;
            accountToAdd.balance       = 0.0;
            BankAccount.RunPost(accountToAdd);
            List <BankAccount> updatedAccounts = await BankAccount.getAllAccounts(sessionUser.phoneNo);

            Person.loginCredentials creds = new Person.loginCredentials(sessionUser.phoneNo, sessionUser.password);
            Person updatedUser            = await Person.getUser(creds);

            List <BankAccount> useraccounts = await BankAccount.getAllAccounts(updatedUser.phoneNo);

            await Navigation.PushAsync(new MainPage(updatedUser, updatedAccounts));
        }
        private async void Button_Clicked_TransferFunds(object sender, EventArgs e)
        {
            string      selectedaccName = accountPicker.Items[accountPicker.SelectedIndex];
            BankAccount ibanFromAcc     = accounts.FirstOrDefault(a => a.accountName == selectedaccName);
            string      ibanFROM        = ibanFromAcc.iban;
            string      ibanToSendTo    = ibanInput.Text;
            double      amountToSend    = Convert.ToDouble(transferAmount.Text);

            BankAccount.BankPutDetails detailsToPass = new BankAccount.BankPutDetails(ibanFROM, ibanToSendTo, amountToSend);
            BankAccount.RunBankPut(detailsToPass);

            List <BankAccount> updatedAccounts = await BankAccount.getAllAccounts(sessionUser.phoneNo);

            Person.loginCredentials creds = new Person.loginCredentials(sessionUser.phoneNo, sessionUser.password);
            Person updatedUser            = await Person.getUser(creds);

            List <BankAccount> useraccounts = await BankAccount.getAllAccounts(updatedUser.phoneNo);

            await Navigation.PushAsync(new MainPage(updatedUser, updatedAccounts));
        }