For events accepting only Stripe or PayPal payments, we are able to deduct our fee automatically at the time of transaction via the integration, so you shouldn't need to add a credit card on file.
However, if you're using our Pay by invoice feature, we do require a card on file so that we can charge you the fees on these transactions at the end of each month. You can see a list of your invoices and a breakdown of costs at https://billing.tito.io.
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