How to use Slack resource in the REST Endpoint?

[Viktoria]

Please help me understand how to use the Scriptrunner's resource in the REST endpoint. Right now, my script does not work without a token in it, but I want to hide it with the Resource.

I use it to send a POST http request with ${slackToken}:

def http = new HTTPBuilder("https://slack.com/api/chat.postMessage")
http.request(Method.POST) {
headers.'Authorization' = "Bearer ${slackToken}"
headers.'Content-Type' = 'application/json; charset=utf-8'

def payload = [
channel: channel,
text: previewText,
attachments: [[
color : color,
blocks: blocks
]]
]

send(ContentType.JSON, JsonOutput.toJson(payload))

response.success = { resp, reader ->
def parsed = reader
slackResponse.append(parsed)
slackStatus = 200
}
response.failure = { HttpResponseDecorator resp ->
slackResponse.append("Slack error: ${resp.status}")
slackStatus = resp.status
}
}

return Response.status(slackStatus).entity(slackResponse.toString()).build()

[Viktoriia Boiko]

pls delete this question, I chose wrong deployment type, it should be Data Center and I already created duplicated question