curl --request POST \
  --url https://saas.pads365.com/rdx/NDS.Services.Authentication/api/v1/ExternalAuthenticationProvider/Save \
  --header 'Content-Type: application/json' \
  --data '{
  "Provider": {
    "Id": "<string>",
    "Type": "<string>",
    "Name": "<string>",
    "FederationServiceIdentifier": "<string>",
    "MetaDataUrl": "<string>",
    "ReplyUrl": "<string>",
    "Configuration": {
      "Certificates": [
        {
          "Thumbprint": "<string>",
          "External": true
        }
      ]
    }
  }
}'

{
  "Succeeded": true,
  "Message": "<string>",
  "Code": "<string>",
  "ExternalAuthenticationProviderId": "<string>"
}