signed_request.json

{
  "context": {
    "user": {
      "fullName": "Nakamura Hiroshi",
      "userId": "005x0000000KzS8AAK",
      "userName": "XXXX",
      "email": "XXXX",
      "profilePhotoUrl": "/profilephoto/005/F",
      ...
    },
    "environment": {
      "locationUrl": "https://prerelna1.pre.sales...",
      ...
    },
    "organization": {
      "name": "Canvas Dev",
      ...
    },
    ...
  },
  "algorithm": "HMACSHA256",
  "clientId": "3MVG9lKcPoNINVBK6T3BKqDVDL6Mk.ERE0...",
  "oauthToken": "00Dx00000009bQO!AQIAQGERNsLuDpY2...",
  "instanceUrl": "https://prerelna1.pre.salesforc..."
  ...
}