Trello api - editing a description of an existing card?

This is my current code:

function trello:SetDescription(cardId, msg)
	local url = "https://api.trello.com/1/cards/" ..cardId.. "/desc" ..addon
	local send = { value = msg }
	
	local data = httpService:JSONEncode(send)
	return httpService:PostAsync(url, data)
end

And I'm currently receiving a HTTP 404 not found, the card exists as for when I go to the link from print(URL) it gives shows me json text with that card, but obviously, something is wrong.

The original model does not contain a SetDescription; https://www.roblox.com/library/214265621/Trello-API

Also, second question on the Trello API docs here what do the "PUT" "DELETE" etc represent? What are the differences in what you need "to do"?

Sorry the comment thingy does not show up for me

Have you given it permission to do it when you got your api key?