ConfirmTemplate.py

message = TemplateSendMessage(
    alt_text='Confirm template',
    template=ConfirmTemplate(
        text='Are you sure?',
        actions=[
            PostbackTemplateAction(
                label='postback',
                text='postback text',
                data='action=buy&itemid=1'
            ),
            MessageTemplateAction(
                label='message',
                text='message text'
            )
        ]
    )
)
line_bot_api.reply_message(event.reply_token, message)