Payment Processing: What it is and how it works

Online commerce is expanding rapidly, increasing the importance of payment processing systems that securely transfer funds between customers and merchants through gateways, processors, card networks, issuing banks, and acquiring banks. The process typically involves payment authorization, fraud and funds checks, approval or decline messages, and eventual settlement, with cards, digital wallets, and buy now, pay later services among the main online payment methods. Security and regulatory compliance, particularly with PCI DSS, are central considerations, supported by encryption, tokenisation, biometric or multi-factor authentication, and AI-based fraud monitoring. Merchants must also manage risks such as chargebacks, phishing, stolen card data, and transaction fees, while seeking providers that offer broad payment-method coverage, international currencies, integration capabilities, analytics, and scalable pricing. The material compares Airwallex, PayPal, and Stripe, presenting Airwallex as a cross-border-focused option with multicurrency settlement, lower foreign-exchange fees, fraud tools, and eCommerce integrations, while noting that processing and settlement times vary by payment method and financial institution.

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