def METHOD_NAME(exp):
    # Since the auth API doesn't verify the token on the client side
    # and only looks at the claims, only the claims part matters.
    claims = json.dumps({"exp": exp}).encode("utf-8")
    claims_enc = base64.urlsafe_b64encode(claims).decode("ascii").rstrip("=")
    return "DUMMYHEADER.%s.DUMMYSIG" % claims_enc