What security considerations should be taken into account when integrating payment systems into a web shop using PHP?

When integrating payment systems into a web shop using PHP, it is crucial to prioritize security to protect sensitive customer data. Some important considerations include using HTTPS for secure communication, validating user input to prevent SQL injection and cross-site scripting attacks, and implementing proper authentication and authorization mechanisms. 

// Example of implementing HTTPS in PHP
if ($_SERVER['HTTPS'] != 'on') {
    header('Location: https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);
    exit();
}

Keywords

SQL injection Cross-site scripting (XSS) HTTPS PCI DSS compliance Secure coding practices

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