If you would like to update the credit card details for your Cavewire subscription, you can manage that in your Cavewire account.
Firstly, go to https://www.cavewire.com/ and click "Sign In". You can log into your account with the email address that was used to create your Cavewire system in the beginning. This is where you can manage all the details for your account.
To add a new Credit Card, navigate to MANAGE CREDIT CARDS. Do not use the card set up in Account & Payment Setup.
Add the new credit card details and click "Save Credit Card"
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