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var welcomeCard = new builder.HeroCard(session)
    .title('welcome_title')
    .subtitle('welcome_subtitle')
    .images([
        new builder.CardImage(session)
            .url('https://placeholdit.imgix.net/~text?txtsize=56&txt=Contoso%20Flowers&w=640&h=330')
            .alt('contoso_flowers')
    ])
    .buttons([
        builder.CardAction.imBack(session, session.gettext(MainOptions.Shop), MainOptions.Shop),
        builder.CardAction.imBack(session, session.gettext(MainOptions.Support), MainOptions.Support)
    ]);

session.send(new builder.Message(session)
    .addAttachment(welcomeCard));