Can I save payment card information so customers don't have to re-enter it later?

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Yes, absolutely! However your customers will have to confirm that they authorize you to do so when they enter their card details for the first time. 

Upon successful completion of the payment, our API returns a unique Transaction ID. You can use this ID to make a new payment in the future without having to submit any card data. This is a great feature for maximizing conversions and boost online sales!