---
updatedAt: 2026-05-27T09:39:35.000Z
agentTools:
  projectIndex: https://apis.appdome.com/llms.txt
---

# Download Appdome-Built App/SDK

This API allows you to fuse a mobile App/SDK.
After uploading your App/SDK and obtaining the Application ID, you can initiate the build process using an existing Fusion Set.
The `fusion_set_id` is required to fuse (Build) the application.
Once the build is completed, the resulting `task_id`, referred to as the "Appdome Build ID," is necessary for all subsequent task actions and is used as `parent_task_id`.
This endpoint supports several overrides for customizing the build task, as detailed below.
You can download an AAB file in a universal APK format. To do so, add the parameter action=sign_second_output.

# OpenAPI definition

```json
{
  "openapi": "3.0.0",
  "info": {
    "version": "1.0.0",
    "title": "Appdome API"
  },
  "servers": [
    {
      "url": "https://fusion.appdome.com/api/v1",
      "description": "Main Appdome API Server"
    },
    {
      "url": "{aws_upload_link}",
      "description": "S3 Upload URL",
      "variables": {
        "aws_upload_link": {
          "default": "",
          "description": "The S3 bucket name from the pre-signed URL. Obtained from 'Get AWS Upload Link' route."
        }
      }
    }
  ],
  "components": {
    "securitySchemes": {
      "apiKey": {
        "type": "apiKey",
        "in": "header",
        "name": "Authorization"
      }
    }
  },
  "paths": {
    "/tasks/{task_id}/output#buildApp": {
      "get": {
        "tags": [
          "Tasks"
        ],
        "description": "This API allows you to fuse a mobile App/SDK.\nAfter uploading your App/SDK and obtaining the Application ID, you can initiate the build process using an existing Fusion Set.\nThe `fusion_set_id` is required to fuse (Build) the application.\nOnce the build is completed, the resulting `task_id`, referred to as the \"Appdome Build ID,\" is necessary for all subsequent task actions and is used as `parent_task_id`.\nThis endpoint supports several overrides for customizing the build task, as detailed below.\nYou can download an AAB file in a universal APK format. To do so, add the parameter action=sign_second_output.",
        "summary": "Download Appdome-Built App/SDK",
        "parameters": [
          {
            "in": "path",
            "name": "task_id",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "in": "query",
            "name": "action",
            "required": false,
            "schema": {
              "type": "string",
              "enum": [
                "sign_second_output"
              ]
            }
          }
        ],
        "security": [
          {
            "apiKey": []
          }
        ],
        "responses": {
          "200": {
            "description": "The downloaded App/SDK.",
            "content": {
              "application/json": {}
            }
          }
        }
      }
    }
  }
}
```