In PHP, what best practices should be followed to ensure that user transactions are securely processed and account balances are updated accurately after payments are made through third-party services like PayPal?

To ensure secure processing of user transactions and accurate updating of account balances after payments through third-party services like PayPal, it is essential to validate the payment response from PayPal, securely store transaction details, and update account balances only after successful payment confirmation. 

// Validate PayPal payment response
$payment_status = $_POST['payment_status'];
if ($payment_status === 'completed') {
    // Securely store transaction details
    $transaction_id = $_POST['txn_id'];
    $amount_paid = $_POST['mc_gross'];
    
    // Update account balance after successful payment confirmation
    $user_id = $_POST['custom']; // Assuming 'custom' field contains user ID
    $new_balance = getUserBalance($user_id) + $amount_paid;
    updateAccountBalance($user_id, $new_balance);
}

Keywords

PHP security transactions PayPal account balances

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