https://api.slack.com/custom-integrations/legacy-tokens
https://api.slack.com/docs/messages/builder
curl -X POST -H "Content-type: application/json" -H "Authorization: Bearer xoxp-283316862324-298911817009-298923149681-44f585044d66634f5701618e97cd1c0b" --data @data.json https://wirecard-issuing.slack.com/api/chat.postMessage
{"text":"another message from tech user", "channel":"team-brand-server"}
!!! for Windows need to escape " symbol