Create-a-fully-functional-payment-gateway-interface-using-React.-The-design-should-include-fields-for-user-input,-such-as-cardholder-name,-card-number,-expiration-date,-CVV,-and-billing-address,-with-form-validation-for-secure-and-accurate-data-entry.-Include-options-for-different-payment-methods-like-credit-card,-debit-card,-and-digital-wallets.-Implement-secure-handling-of-payment-data-and-integrate-success/error-states-for-smooth-feedback-on-transactions.-Provide-a-modern,-clean-UI,-with-a-clear-call-to-action-button,-and-ensure-the-design-is-responsive-and-optimized-for-both-desktop-and-mobile-views.-The-payment-flow-should-also-include-a-loading-state,-success-and-error-feedback,-and-seamless-transitions-throughout-the-process.