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Payments are processed by Polar, the merchant of record for myClerkBook.

Where your card details live

They live with Polar, and nowhere else. myClerkBook never receives, transmits or stores a card number. Card details are entered into Polar’s own payment form inside the checkout window, and what reaches myClerkBook is the outcome of the payment, not the instrument.
This is a deliberate architectural boundary rather than a limitation. Keeping card data entirely out of myClerkBook is what keeps it out of scope for card handling, which is the strongest guarantee available: we cannot lose what we never hold.

What you can pay with

Polar accepts major debit and credit cards. The exact set available to you depends on your country and is shown in the payment form at checkout, so the form is the authority, not this page.

Changing your card

Adding or changing a saved card is done through Polar’s own portal, reached from any receipt Polar sends you. That hand-off exists for the same reason as everything above: the page that takes a card number has to be Polar’s.
An expiring card is worth acting on before it expires. A renewal that fails because the card on file has lapsed will show on your billing page as an overdue payment. Updating the card through Polar’s portal resolves it.

Currency

Plans are priced in US dollars. Your bank converts at its own rate on the day, and may add its own foreign-transaction fee. Neither the rate nor the fee is set by myClerkBook or by Polar.
The currency your plan is priced in has nothing to do with the currency your books are kept in. A book kept in ZAR is unaffected by the plan being billed in USD.

Next: invoices and receipts

Where your receipts come from and how to get a copy.