curl --request GET \
  --url https://api.projectdiscovery.io/v1/scans/config/severity \
  --header 'X-API-Key: <api-key>'

{
  "custom_severity_mappings": [
    {
      "id": 123,
      "template_id": "<string>",
      "original_severity": "<string>",
      "custom_severity": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "vuln_id": "<string>"
    }
  ]
}