<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_payload_data(self, token, key):
 """Helper method to get the payload of the JWT token."""

        if self.get_settings('OIDC_ALLOW_UNSECURED_JWT', False):
            header, payload_data, signature = token.split(b'.')
            header = json.loads(smart_text(b64decode(header)))

            # If config allows unsecured JWTs check the header and return the decoded payload
            if 'alg' in header and header['alg'] == 'none':
                return b64decode(payload_data)

        # By default fallback to verify JWT signatures
        return self._verify_jws(token, key)