curl --request GET \
  --url https://api.wappfy.com.br/api/{session}/channels/{id} \
  --header 'apikey: <api-key>'

{
  "id": "123123123123@newsletter",
  "name": "Channel Name",
  "invite": "https://www.whatsapp.com/channel/111111111111111111111111",
  "preview": "https://mmg.whatsapp.net/m1/v/t24/An&_nc_cat=10",
  "picture": "https://mmg.whatsapp.net/m1/v/t24/An&_nc_cat=10",
  "role": "OWNER",
  "description": "<string>",
  "verified": true,
  "subscribersCount": 123
}