A Daylite account can contain multiple users. However only one credit card can be used for the entire account. An individual payment per user is not possible.
You can change the credit card on file via Marketcircle's website. Log in here and switch to the Plan & Billing section.
Learn how to update your billing information for Daylite Cloud by reading this article:
How can I change my billing details for Daylite Cloud?
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How much does Daylite cost?
How do I subscribe to Daylite Cloud?
Where can I find my Daylite Cloud invoices?