Frequently asked questions
What payment methods are supported?▾
Visa and Mastercard through Quantum Processing. Iframe mode keeps card entry on Quantum servers; direct mode requires PCI DSS on the merchant side.
How does 3-D Secure work?▾
Depending on the card, Quantum returns RedirectUrl3DS (RedirectGet) or HtmlIframeForm (RedirectPost). Complete bank verification before the payment is finalized.
Can I refund or void a transaction?▾
Yes. Approved sales can be refunded and authorized transactions can be voided through the merchant's payment integration with Quantum Processing.
What is A2C / P2P?▾
Account-to-card transfer from your merchant wallet balance to a recipient card. It is a two-step flow: init with TransactionType P2P, then complete with card number or token.
How are webhooks verified?▾
Callbacks include an HMAC-MD5 signature built from MerchantKey, TransactionId, and your SecretKey. Merchants validate signatures server-side before updating order status.
Where do I get API credentials?▾
MerchantKey, SecretKey, ProcessingId, and TemplateId are issued by Quantum Processing when you onboard as a merchant.