What are common pitfalls to avoid when integrating PayPal into a website using PHP?

One common pitfall to avoid when integrating PayPal into a website using PHP is not properly validating and sanitizing input data before sending it to PayPal's API. This can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To prevent this, always validate and sanitize user input before using it in API requests. 

// Example of validating and sanitizing user input before sending it to PayPal's API
$amount = $_POST['amount'];

// Validate input
if (!is_numeric($amount)) {
    // Handle invalid input error
}

// Sanitize input
$amount = filter_var($amount, FILTER_SANITIZE_NUMBER_FLOAT);

// Use the sanitized input in PayPal API request

Keywords

PayPal integration PHP API error handling security.

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