If you subscribed with a credit card
Update the card on file
To update your credit card on file they will need to first log into their account on your site.
- After logging in, click on the Customer Avatar in the top right corner of the page.
- Then, select Settings from the dropdown.
- Click Billing Info in the top right corner of the page.
- Click
…next to your card information. - Select Replace.
- Complete the prompt to replace card.
- Then, click Update to apply and keep your changes:
If you subscribed using Paypal
See this: Paypal's help article