Credit card - mundipagg/magento2 GitHub Wiki
To pay with the Credit Card payment method, please follow the steps below:
- Procced to the checkout screen as usual.
- On the checkout screen, on Payment Information Section, select Credit Card payment method. After that, the credit card payment data form will be showed. Fill the inputs with credit card data or use a a saved credit card:

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At this point, you can save the credit card or even inform another buyer.
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Continue the checkout normally.