You can add or edit your payment methods by following these directions.
1. Log in to your Mass Apothecary account at
https://massapothecary.com/my-account/
2. Click on the "Payment Methods" tab.
3. To add a new payment method, click on the "Add Payment Method" button.
4. Add your payment details and then click the "Add Payment Method" button.
Now your new payment method is saved to your account.