@Override
    public boolean equals(Object o) {
        if (o == this) {
            return true;
        }
        if (!(o instanceof RefreshAccessTokenRequest)) {
            return false;
        }
        final RefreshAccessTokenRequest other = (RefreshAccessTokenRequest) o;
        return super.equals(o) && Objects.equals(refreshToken, other.refreshToken);
    }
A request to refresh an access token using a refresh token as per
<a href="https://datatracker.ietf.org/doc/html/rfc6749#section-6">RFC 6749, Section 6</a>.
oauth2/src/main/java/com/linecorp/armeria/client/auth/oauth2/RefreshAccessTokenRequest.java