You can easily upgrade your Casa membership to a higher level anytime.
If you have an existing Single-Key Wallet, or an existing multisig wallet in your Casa App, those wallets will not be affected when you upgrade.
For example, if you have a Casa Gold membership, and have set up a Single-Key Wallet and a 2 of 3 multisig wallet, and upgrade your account to Platinum, you'll just have additional access to your new 3 of 5 wallet, which you'll set up with a totally different set of keys.
In the above example, you can continue to use any 3 of your Bitcoin wallets indefinitely.
How do I sign up?
You can use the following links to upgrade. Simply click the link, log in to your Casa account, and pay for the upgrade.
Note that if you have recently paid for another membership, then you should be automatically prorated for any unused time on that membership. For example, if you paid $120 for Gold 6 months ago (1/2 a year), then upgrade to Platinum, you will automatically get $60 off your Platinum membership at checkout.