The actual JSON string that was signed, e.g.:
{
"date": 1234567890,
"nonce": 512,
"method": "GetAccessToken",
"value": {}
}
The signature over the JSON-serialized request data (nonce, date, etc.).
The user's Sui address, zero-padded if needed.
The request body for obtaining or refreshing an access token. The user signs a "GetAccessToken" method message plus any relevant fields.