Open modal using Slack command - node.js

Question

I have a Slack command which displays a button. When I click on this button I need to display a modal. For this, after clicking it I do this:
const dialog = {
callback_id: "submit-ticket",
elements: [
{
hint: "30 second summary of the problem",
label: "Title",
name: "title",
type: "text",
value: "teste"
},
{
label: "Description",
name: "description",
optional: true,
type: "textarea"
},
{
label: "Urgency",
name: "urgency",
options: [
{ label: "Low", value: "Low" },
{ label: "Medium", value: "Medium" },
{ label: "High", value: "High" }
],
type: "select"
}
],
submit_label: "Submit",
title: "Submit a helpdesk ticket"
};
const modalInfo = {
dialog: JSON.stringify(dialog),
token, // this is correct
trigger_id: actionJSONPayload.trigger_id
};
// This is what I get confused with...
// Method 1
slack.dialog.open(modalInfo).catch(err => {
console.log("ERROR: ", err);
});
// end method 1
// Method 2
sendMessageToSlackResponseURL(actionJSONPayload.response_url, modalInfo);
...
function sendMessageToSlackResponseURL(responseURL: any, JSONmessage: any) {
const postOptions = {
headers: {
"Content-type": "application/json"
},
json: JSONmessage,
method: "POST",
uri: responseURL
};
request(postOptions, (error: any, response: any, body: any) => {
if (error) {
console.log("----Error: ", error);
}
});
}
// end method 2
I get always Error: invalid_trigger using method1 when this trigger is something that my button is generating automatically.
Method 2 doesn't throw any error but doesn't open any modal/dialog either.
The official documentation is not quite clear and I don't know if I need to call dialog.open or views.open. Either way, the last one is not available from Slack package
This is also the button I'm displaying before anything:
const message = {
attachments: [
{
actions: [
{
name: "send_sms",
style: "danger",
text: "Yes",
type: "button",
value: "yes"
},
{
name: "no",
text: "No",
type: "button",
value: "no"
}
],
attachment_type: "default",
callback_id: "alert",
color: "#3AA3E3",
fallback: "We could not load the options. Try later",
text: "Do you want to alert by SMS about P1 error/fix?"
}
],
text: "P1 SMSs"
};

Answer 1

Copy a modal from here
const headers = {
headers: {
"Content-type": "application/json; charset=utf-8",
"Authorization": "Bearer " + token
}
};
const modalInfo = {
"token": token,
"trigger_id": reqBody.trigger_id,
"view": slack.modal
};
axios
.post("https://slack.com/api/views.open", modalInfo, headers)
.then(response => {
const data = response.data;
if (!data.ok) {
return data.error;
}
})
.catch(error => {
console.log("-Error: ", error);
});
But most importantly, when we do some changes to our app we need to reinstall it and also when we do it, the token changes and this is something I couldn't find on the documentation