Upgrading is easy and possible at any time. Of course, you keep your existing codes.
Go to http://qrcode.kaywa.com/static/pricing and click on the plan you would like to purchase.
Once you choose to upgrade, we immediately stop your old subscription and deduct the amount that you paid for your old subscription from the price of the new plan.
Other ways to upgrade:
When you reach the maximum number of codes allowed by your account, the green “Generate Safe” button will become an “Upgrade Now” button. When you click on that button, a window pops up to guide you through the upgrade process.
Another popular path for upgrading your account is to visit your account page by clicking on your username in the top right corner of the page and then clicking on the “Account” link.