curl --request GET \
  --url https://saas.pads365.com/rdx/NDS.Services.Authentication/api/v1/ExternalAuthenticationProvider

{
  "Succeeded": true,
  "Message": "<string>",
  "Code": "<string>",
  "Providers": [
    {
      "Id": "<string>",
      "Type": "<string>",
      "Name": "<string>",
      "FederationServiceIdentifier": "<string>",
      "MetaDataUrl": "<string>",
      "ReplyUrl": "<string>",
      "Configuration": {
        "Certificates": [
          {
            "Thumbprint": "<string>",
            "External": true
          }
        ]
      }
    }
  ]
}