var response = slack.methods().chatPostMessage(r -> r.token(token)
    .blocks(
        asBlocks(
            section(s -> s.text(plainText("Greetings!"))),
            contextActions(c -> c.
                elements(
                    asContextActionsElements(
                        feedbackButtons(b -> b
                            .positiveButton(
                                feedbackButton(a -> a
                                    .text(plainText(":+1:"))
                                    .value("+1")
                                )
                            )
                            .negativeButton(
                                feedbackButton(a -> a
                                    .text(plainText(":-1:"))
                                    .value("-1")
                                )
                            )
                        ),
                        iconButton(b -> b
                            .icon("trash")
                            .text(plainText("Remove"))
                            .confirm(
                                confirmationDialog(d -> d
                                    .title(plainText("Oops"))
                                    .text(plainText("This response might've been just alright..."))
                                    .style("danger")
                                )
                            )
                        )
                    )
                )
            )
        )
    )
    .channel("C0123456789"));