> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mapp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Get a system user

> Retrieves the system user identified by the specified system user ID, external ID, or email address.Note: It is not required to fill all params fields. It's enough to fill just one field out off three (systemUserId or email)

## OpenAPI

````json GET /systemuser/get
{
  "openapi": "3.0.4",
  "info": {
    "title": "Engage public API",
    "version": "1"
  },
  "servers": [
    {
      "url": "https://your-engage-domain.com/api/rest"
    }
  ],
  "tags": [
    {
      "name": "Address Attributes"
    },
    {
      "name": "Async"
    },
    {
      "name": "Audit Log"
    },
    {
      "name": "Automation"
    },
    {
      "name": "Blacklist"
    },
    {
      "name": "CMS"
    },
    {
      "name": "Contact"
    },
    {
      "name": "Content"
    },
    {
      "name": "Coupon"
    },
    {
      "name": "Draft Message"
    },
    {
      "name": "Ecommerce"
    },
    {
      "name": "Group"
    },
    {
      "name": "Group Attributes"
    },
    {
      "name": "Landing Page"
    },
    {
      "name": "Member Attributes"
    },
    {
      "name": "Membership"
    },
    {
      "name": "Message"
    },
    {
      "name": "Meta"
    },
    {
      "name": "Mobile Push"
    },
    {
      "name": "Prepared Message"
    },
    {
      "name": "Process"
    },
    {
      "name": "Profile Attributes"
    },
    {
      "name": "Related Data"
    },
    {
      "name": "Segmentation"
    },
    {
      "name": "System"
    },
    {
      "name": "System User"
    },
    {
      "name": "Usage Statistics"
    },
    {
      "name": "User"
    },
    {
      "name": "Whiteboard"
    }
  ],
  "paths": {
    "/systemuser/get": {
      "get": {
        "tags": [
          "System User"
        ],
        "summary": "Get a system user",
        "description": "Retrieves the system user identified by the specified system user ID, external ID, or email address.Note: It is not required to fill all params fields. It's enough to fill just one field out off three (systemUserId or email)",
        "operationId": "getSystemUser",
        "parameters": [
          {
            "name": "systemUserId",
            "in": "query",
            "description": "ID of the user",
            "required": true,
            "schema": {
              "type": "integer",
              "format": "int64"
            }
          },
          {
            "name": "email",
            "in": "query",
            "description": "Email of the user",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "externalId",
            "in": "query",
            "description": "External ID of the user",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "",
            "content": {
              "application/octet-stream": {
                "schema": {
                  "$ref": "#/components/schemas/SystemUser"
                }
              }
            }
          },
          "400": {
            "description": "",
            "content": {
              "application/octet-stream": {}
            }
          },
          "404": {
            "description": "Error response: {<br>\"errorActor\": \"CLIENT\",<br>\"errorCode\": \"INVALID_REQUEST\",<br>\"message\": \"Not Found\"<br>}",
            "content": {
              "application/octet-stream": {}
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "SystemUser": {
        "type": "object",
        "properties": {
          "id": {
            "type": "integer",
            "format": "int64"
          },
          "type": {
            "type": "string"
          },
          "email": {
            "type": "string"
          },
          "firstName": {
            "type": "string"
          },
          "lastName": {
            "type": "string"
          },
          "language": {
            "type": "string"
          },
          "timeZone": {
            "type": "string"
          },
          "messagingRole": {
            "type": "string"
          },
          "expiryDate": {
            "type": "string"
          },
          "externalId": {
            "type": "string"
          },
          "lastLoginDate": {
            "type": "string"
          }
        }
      }
    }
  }
}
````