curl --request GET \
  --url https://app.dograh.com/api/v1/organizations/telephony-providers/metadata

{
  "providers": [
    {
      "provider": "<string>",
      "display_name": "<string>",
      "fields": [
        {
          "name": "<string>",
          "label": "<string>",
          "type": "<string>",
          "required": true,
          "sensitive": true,
          "description": "<string>",
          "placeholder": "<string>"
        }
      ],
      "docs_url": "<string>"
    }
  ]
}