curl --request POST \
  --url https://api.wappfy.com.br/api/{session}/groups/join \
  --header 'Content-Type: application/json' \
  --header 'apikey: <api-key>' \
  --data '{
  "code": "https://chat.whatsapp.com/1234567890abcdef"
}'

{
  "id": "123@g.us"
}