How to use the josepy.b64encode function in josepy

successful.
        :rtype: bool

        """
        parts = self.key_authorization.split('.')  # pylint: disable=no-member
        if len(parts) != 2:
            logger.debug("Key authorization (%r) is not well formed",
                         self.key_authorization)
            return False

        if parts[0] != chall.encode("token"):
            logger.debug("Mismatching token in key authorization: "
                         "%r instead of %r", parts[0], chall.encode("token"))
            return False

        thumbprint = jose.b64encode(account_public_key.thumbprint(
            hash_function=self.thumbprint_hash_function)).decode()
        if parts[1] != thumbprint:
            logger.debug("Mismatching thumbprint in key authorization: "
                         "%r instead of %r", parts[0], thumbprint)
            return False

        return True

def validation(self, account_key, **unused_kwargs):
        """Generate validation.

        :param JWK account_key:
        :rtype: unicode

        """
        return jose.b64encode(hashlib.sha256(self.key_authorization(
            account_key).encode("utf-8")).digest()).decode()

def key_authorization(self, account_key):
        """Generate Key Authorization.

        :param JWK account_key:
        :rtype unicode:

        """
        return self.encode("token") + "." + jose.b64encode(
            account_key.thumbprint(
                hash_function=self.thumbprint_hash_function)).decode()