Step1. After a successful subscription, they will have to log in to their account from the Shopify login page as a Member.
Step2. After login they will be able to see the Membership plan details on the My Account page.
Step3. In order to update their Credit Card, they need to click on Update Card.
Step4. Post clicking on Update Card they need to Enter their Credit Card details ( Card #, Expiry Date & CVV ) and Click on Update Card.