Thanks for the info! So yeah, I read through it and created the app, got the token needed...
Then checking the {urlsend} command I was able to see it could be used to send the text:
{urlsend: https://slack.com/api/chat.postMessage; method=POST;headers= Authorization = Bearer Token XXXXX, content-type= application/json{"channel": "C03HPG34ZCH", "text": "Hello world"}}
But I'm not sure what the order of the properties should be.
I'm testing the Post method in another website and it is sending the message normally.
Would you know how to properly create the function here in TextBlaze?