When the PayPal Powered by Braintree payment is enabled, a customer can choose it at checkout to pay for the order.
Braintree allows customers to submit the CC data directly on your X-Cart site, and this data will be processed securely.
Also, Braintree allows saving credit card tokens for further use, and a customer can choose a saved card to pay the order:
Customers can manage their saved cards in the Braintree credit cards tab when logged in to the customer’s account in the storefront:
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