Do static residential proxies support subscription renewal for an order?

Yes, you can renew your static residential proxy before its expiration, and thus keep the same IP address. A new duration from your plan level is added to the existing expiration date. For example, if you have a 7-day IP in your account, and on the 7th day you renew it with a 30-day plan, your IP address will remain for another 30 days.