> ## 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.

# Update a segment plan

> Overwrites an existing segment plan. The query parameter <code>id</code> identifies the plan; the request body is a wrapper whose <code>json</code> field carries the full plan JSON document <b>as a string</b> (escaped). Update replaces the <b>whole</b> plan, so fetch the current plan with <code>get</code> first, modify it, then send it back here. If the plan JSON also contains an id it must match the query <code>id</code>. Returns the updated plan.<br/><br/><b>Example body</b><pre>{
  "json": "{\"id\":\"FF784C2A-...\",\"name\":\"My plan\",\"nodes\":[ ... ]}"
}</pre>

## OpenAPI

````json PUT /segmentation/update
{
  "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/update": {
      "put": {
        "tags": [
          "Segmentation"
        ],
        "summary": "Update a segment plan",
        "description": "Overwrites an existing segment plan. The query parameter <code>id</code> identifies the plan; the request body is a wrapper whose <code>json</code> field carries the full plan JSON document <b>as a string</b> (escaped). Update replaces the <b>whole</b> plan, so fetch the current plan with <code>get</code> first, modify it, then send it back here. If the plan JSON also contains an id it must match the query <code>id</code>. Returns the updated plan.<br/><br/><b>Example body</b><pre>{\n  \"json\": \"{\\\"id\\\":\\\"FF784C2A-...\\\",\\\"name\\\":\\\"My plan\\\",\\\"nodes\\\":[ ... ]}\"\n}</pre>",
        "operationId": "update",
        "parameters": [
          {
            "name": "id",
            "in": "query",
            "description": "ID of the plan to update (GUID).",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "requestBody": {
          "description": "Wrapper carrying the full plan JSON document as a string in its 'json' field.",
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/SegmentationPayload"
              }
            }
          },
          "x-bodyName": "body"
        },
        "responses": {
          "200": {
            "description": "The updated plan as a JSON document.",
            "content": {
              "application/json": {
                "schema": {
                  "type": "string"
                }
              }
            }
          },
          "400": {
            "description": "bad request",
            "content": {
              "application/json": {}
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "SegmentationPayload": {
        "type": "object",
        "properties": {
          "json": {
            "type": "string"
          }
        }
      }
    }
  }
}
````