Httpoison Post JSON

url = "http://myurl"
body = Poison.encode!(%{
  "call": "MyCall",
  "app_key": key,
  "param": [
    %{
      "page": page,
      "registres": registers,
      "filter": filter
    }
  ]
})
headers = [{"Content-type", "application/json"}]
HTTPoison.post(url, body, headers, [])
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