How do I update my credit card info if I signed up through the website?

You can manage your subscription, including updating your credit card details, from your profile.

Sign in from the website (not the app on your mobile device) at https://app.golfforever.com/sign_in and then click on your name (or the profile icon) in the top right corner of the page.

On the next screen, click Subscriptions and follow the prompts, then you'll get to the page where you can update your card details.