Function jwtvault::utils::token::encode_client_token

pub fn encode_client_token<T: AsRef<[u8]>>(
    key: &PrivateKey, 
    user_id: T, 
    _buf: Option<HashMap<u64, Vec<u8>>>, 
    _ref: u64, 
    exp: Option<i64>, 
    nbf: Option<i64>, 
    iat: Option<i64>
) -> Result<String, Error>