> ## 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.

# Trigger a segment count

> Returns count size for requested termId.

## OpenAPI

````json POST /segmentation/triggerCount
{
  "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": {
    "/segmentation/triggerCount": {
      "post": {
        "tags": [
          "Segmentation"
        ],
        "summary": "Trigger a segment count",
        "description": "Returns count size for requested termId.",
        "operationId": "triggerCount",
        "parameters": [
          {
            "name": "termId",
            "in": "query",
            "description": "ID of segment term user wants to get a count for.",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Returns uuid of order for submitted termId",
            "content": {
              "application/octet-stream": {
                "schema": {
                  "type": "string"
                }
              }
            }
          },
          "400": {
            "description": "Provided term ID is invalid, No term id found for specified ID, An unexpected backend error has occurred.",
            "content": {
              "application/octet-stream": {}
            }
          }
        }
      }
    }
  }
}
````