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Box supports external integration through an HTTP-based REST API.
Restriction: -REST API does not support resume on upload
-No mdtm(File modification time) changes.
-Large file upload CrushFTP stores the file temporary at CrushFTP install folder/box/<<box username>>

Create new custom app at https://app.box.com/developers/console.


CrushFTP use JWT Authentication method (https://developer.box.com/guides/authentication/jwt/), and not OAuth2. Select JWT based authentication.



Check the "Make API calls using the as-user header" checkbox at Configuration -> Advanced Features



Generate the RSA keypair for JWT at Configuration -> Add and Manage Public Keys



Save your app changes and dwonload JSON file from Configuration -> App Settings
The JSON file should contains:

{
  "boxAppSettings": {
    "clientID": "ogXXXXXXXXXXXXXXXX",
    "clientSecret": "laAXXXXXXXXXXXX",
    "appAuth": {
      "publicKeyID": "cgXXXXXXXXX",
      "privateKey": "-----BEGIN ENCRYPTED PRIVATE KEY-----\nXXXXXXXXXXXXXXXXXXXXXnblc=\n-----END ENCRYPTED PRIVATE KEY-----\n",
      "passphrase": "aXXXXXXXXXXXXXXXXXXXXe"
    }
  },
  "enterpriseID": "2XXXXXXXXX5"
}

On CrushFTP provide the box login username as username and the path of JSON config file.