install.json

{
  "$schema": "http://json.schemastore.org/install",
  "resources": {
    "body": [
      {
        "type": "style",
        "src": "./source/app.css"
      },
      {
        "type": "script",
        "src": "./source/app.js"
      }
    ]
  },
  "preview": {
    "handlers": [
      {
        "options": ["_default"],
        "execute": "INSTALL_SCOPE.setOptions(INSTALL_OPTIONS)"
      }
    ]
  },
  "hooks": [
    {
      "endpoint": "https://igotthe.info/docusign",
      "events": ["option-change:account"],
      "block": true,
      "authenticate": ["account"]
    },
    {
      "endpoint": "https://igotthe.info/docusign",
      "events": ["option-change:docusignAccount"],
      "block": true,
      "authenticate": ["account"]
    },
    {
      "endpoint": "https://igotthe.info/docusign",
      "events": ["option-change:powerform"],
      "block": true,
      "authenticate": ["account"]
    }
  ],
  "options": {
    "properties": {
        "account": {
          "title": "Docusign Account",
          "type": "object",
          "format": "account",
          "services": ["docusign"],
          "order": 0
        },
      "location": {
        "title": "Message Location",
        "description": "Where should the message appear?",
        "order": 1,
        "type": "object",
        "format": "element",
        "default": {
          "selector": "body",
          "method": "prepend"
        }
      }
    }
  }
}