A service that authorizes and processes credit card and digital payments for online transactions. Acts as the intermediary between the customer's bank and the merchant's bank.
Understanding Payment Gateway
A payment gateway is a technology service that authorizes and processes credit card, debit card, and digital wallet payments for online transactions. It acts as the encrypted intermediary between the customer's browser and the merchant's payment processor, ensuring sensitive card data is transmitted securely.
When a customer enters their payment information at checkout, the payment gateway encrypts the data, sends it to the payment processor, which forwards it to the card network (Visa, Mastercard) and issuing bank for authorization. The approval or decline response travels back through the same chain in milliseconds.
Popular payment gateways include Stripe, PayPal, Square, Authorize.net, and Braintree. Many ecommerce platforms (like Shopify Payments) have built-in payment gateways. Each gateway charges processing fees, typically 2.4-2.9% plus a per-transaction flat fee.
Why It Matters for Ecommerce
Payment gateway fees are a fixed cost on every transaction that directly reduces your margin. For high-volume sellers, even small differences in processing rates can add up to thousands of dollars annually. Understanding and tracking these fees helps you choose the most cost-effective gateway and ensure you're not being overcharged.
Practical Example
Your Shopify store processes $50,000/month in transactions through Shopify Payments (2.9% + $0.30). Monthly processing fees: $50,000 × 2.9% + ($0.30 × 1,200 orders) = $1,450 + $360 = $1,810. Switching to a negotiated rate of 2.4% + $0.25 would save: ($50,000 × 0.5%) + ($0.05 × 1,200) = $250 + $60 = $310/month — $3,720/year.
Related Terms
Payment Processor
A company that handles the technical execution of credit card and debit card transactions between the customer, the merchant, and the issuing/acquiring banks. Examples include Stripe and Square.
EcommerceInterchange Fee
A fee paid by the merchant's bank (acquirer) to the customer's bank (issuer) each time a card transaction is processed. Typically the largest component of credit card processing costs.
EcommercePayout
The net amount a marketplace or payment processor transfers to a seller's bank account after deducting all fees, refunds, and reserves from gross sales.
Put This Knowledge Into Practice
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