Payment processing is the method by which transactions are completed when you buy something, whether online or in a store. When you swipe your card or enter your payment details, the payment processor securely handles the transaction by communicating with your bank and the merchant's bank to ensure the funds are available and transferred. Once the transaction is approved, the payment gateway sends a confirmation back to the merchant, allowing you to receive your purchase. This entire process happens quickly, often in just a few seconds, making it easy for you to shop without worrying about the behind-the-scenes work that ensures your payment is safe and efficient.