To change the card being used as your default credit card for your subscription follow these steps:
- Log into your Hairstory account here
- Click on My Account
- Click on Subscriptions
- Click on the light grey button that says 'Subscription Details'
- Scroll down to Payments Details and select which card to use for the subscription
Note that you can add a new credit card here as well, and then select the newly added card as your default.
Please note, if you want to delete an old card, you will need to navigate to the My Info section and scroll down to Payment Details.