* Get the value for the key 'rate.limit.retry.after.seconds'. <br>
     * The value is, e.g. 60 <br>
     * comment: Retry-After header value in seconds.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getRateLimitRetryAfterSeconds();

    /**
     * Get the value for the key 'rate.limit.retry.after.seconds' as {@link Integer}. <br>