MyDiplom/BuyPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<toolkit:Popup xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
             x:Class="MyDiplom.BuyPage"
               Color="Transparent">
    
    <Border Stroke="Gray" >
        <Border.StrokeShape>
            <RoundRectangle CornerRadius="25"/>
        </Border.StrokeShape>

        <VerticalStackLayout Padding="20" BackgroundColor="White" Spacing="15">

           
            <Label Text="ПОПОЛНЕНИЕ СЧЕТА"
           FontSize="20"
           FontAttributes="Bold"
           HorizontalOptions="Center"
           TextColor="Black" />

            
            <HorizontalStackLayout Spacing="10"
                           BackgroundColor="White"
                           Padding="10,5,0,0"
                           HeightRequest="50"
                           VerticalOptions="Center"
                           HorizontalOptions="Fill">
            <Entry WidthRequest="300" Placeholder="Введите сумму" Keyboard="Numeric" x:Name="AmountEntry"/>
            <Label Text="₽"
               FontSize="18"
               VerticalOptions="Center"/>
            

           
            <Button Text="ПОПОЛНИТЬ"
            BackgroundColor="Black"
            TextColor="White"
            FontAttributes="Bold"
            CornerRadius="10"
            Padding="10"
            HorizontalOptions="End"
            WidthRequest="120"
            Clicked="BuyButtonCliked"/>
        
            </HorizontalStackLayout>


            <Label Text="После нажатия кнопки ОПЛАТИТЬ вы будете перенаправлены на платежную систему"
           FontSize="12"
           TextColor="Gray"
           HorizontalOptions="Start"
           Margin="0,10,0,0" />
            <Button Text="Закрыть" Clicked="CloseButtonClicked"/>

        </VerticalStackLayout>
    </Border>
</toolkit:Popup>