Payment gateway integration is the seamless incorporation of a payment processing service into an online platform, allowing businesses to accept payments electronically. It involves linking the website or application with a payment gateway provider’s system, enabling secure transactions through various payment methods such as credit cards, debit cards, and digital wallets. This integration process typically involves selecting a suitable payment gateway provider, setting up an account, integrating the gateway’s API into the platform, testing the payment process, ensuring security measures are in place, and deploying the integration live. Payment gateway integration enhances customer convenience, streamlines payment processing, and contributes to the overall success of e-commerce businesses.