You can update your card on file directly from your billing portal.
Update from the platform billing portal
Navigate to your billing portal from the platform by hovering over your profile avatar on the home page and clicking the “Billing” option from the dropdown. You can also navigate to the portal by visiting endr.link/billing.
Click the add card button to add a new payment method.
To update your default payment method, click the ellipsis next to the card you want to make the default and select “make default”.