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Taking money reliably, including the refunds, retries and invoices nobody demos.
The happy path takes a day. What takes the time is the failed card, the partial refund, the invoice an accountant will accept and the webhook that arrives twice.
Do you store card details?
Never. The gateway holds them; that is what keeps your scope small.
Can we bill in two currencies?
Yes, with prices set per currency rather than converted at checkout.