You need to go to the email you received after placing an order, then click on the link you received that says “Manage Subscription" Click here. From there, you will be able to add your products, change the delivery date, the order frequency, your billing info or even cancel your subscription. 

Alternatively, you can also go to your Swiss Toniq account by logging in using your username and password Click here, then click on “Manage Subscription » Click here 

Then the next step is to go to "Payment Details" at the bottom of the page and click on Edit. 

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Once you click on "Edit", you will receive an email to confirm your payment information, click on the "Confirm payment information" button on the email and you will be redirected to our store. 
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You can update your billing address by filling out the information on the screen and you can update your card by clicking on the "Change" button at the center of the Credit Card field. 
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When you change your credit card, please ensure to input all of the required information. 

·       Name on the card you would like to use or update
·       Card Number
·       Expiration Date and CVC

Once you have filled these information, you click on "UPDATE CARD". Your updated card will then be registered. 

Here is a preview on how your card looks like after the update:
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Should you have further questions, please do not hesitate to reach out. Thank you