Attackers can try to steal card data by exploiting weaknesses in your systems. To protect your data, and that of your customers, make sure that you implement the security measures described on this page.
This document should be used only for guidance purposes. It is not a complete list of all security measures you should take and it should not be taken as definitive advice.
Secure your accounts
Attackers might try to forge or steal login credentials to gain access to your system environment. Secure all accounts including Customer Area accounts, website accounts, server accounts and accounts for any other third party services you use. Follow these recommendations for any system that requires login credentials:
Use strong passwords with at least twelve characters. This helps to prevent brute force attacks where attackers check different possible passwords hoping to guess correctly.
Block the session after an incorrect password is entered repeatedly, for example after five wrong attempts. This prevents attackers using brute force methods from trying different passwords more than a set number of times.
Give each user their own account and do not allow shared accounts. This means you can trace actions taken by individual users.
Enable two-factor authentication to prevent unauthorized users from logging in.
Replace all vendor-supplied usernames and passwords.
Train staff to be aware of phishing or other social engineering techniques.
See OWASP's authentication cheat sheet for more guidance.
Customer Area accounts
As well as the steps above, make sure you have the following in place for your Customer Area accounts:
Don't give users more permissions than they need to perform their tasks.
When creating a user, define trusted IP addresses from which the user can log in.
Secure your online payments integration
Most online attacks are related to security flaws in your checkout or payment pages. The security of your own webpages and apps is your responsibility, as Adyen has limited ability to prevent attacks in environments we don't control. Read more about your responsibilities, and those of Adyen, in our PCI DSS compliance guide.
Install recommended security updates for all your systems and software as soon as they are available.
Follow security recommendations given by your ecommerce or website provider.
Make sure you can always check what has happened with your back-end systems, so that you can detect and research any unusual activity. Review any changes to your payment pages and related source code.
If you have vulnerable third-party components in your webpage, attackers might be able steal data in various ways, for example by making your website execute their own code.
Follow these best practices to reduce risks:
Make sure that your
returnUrlcannot be easily tampered with. For example, you should not generate the
returnUrlon a system that is publicly accessible. Automatically validate the host part of the URL before including it in your API request. This helps to prevent attackers from changing the destination of a payment redirect to collect a shopper's card data.
If you use Web Drop-in/Components, implement Subresource Integrity hashes.
To have control of the resources that are loaded on your site, implement Content Security Policy (CSP). This helps prevent attacks such as Cross-Site Scripting and data injection attacks. When implementing CSP, specify the following directives, depending on which payment methods you are accepting through Adyen:
script-src: https://*.adyen.com style-src: https://*.adyen.com img-src: https://*.adyen.com
Secure coding practices
These resources are a good starting point:
- OWASP top ten security risks and mitigations
- OWASP's cheat sheets
- NIST Secure Software Development Foundation
Secure your point-of-sale integration
Security risks with in-person payments are related to the payment terminals: physical tampering, and replacing terminals with tampered terminals.
Maintain an inventory of active and inactive terminals, and review it regularly. See the point-of-sale documentation for what to do when a payment terminal is lost or stolen.
Update your terminals to the latest software as soon as possible. We strongly suggest you use automatic updating.
Read the PCI SSC guide on skimming prevention, which explains all forms of skimming, risk profiles, and the impact of skimming. It covers all the points listed below in depth.
To keep the data of your customers safe, make sure that malicious actors cannot access your payment terminals.
- Place the terminals in a monitored environment, both during and outside of business hours. Be aware of suspicious activity around the terminal.
- Inspect your payment terminals to make sure they have not been tampered with. You must do this when you receive a new terminal and also at regular intervals after.
- Verify the identity of anyone who requests access to the terminal, for example individuals claiming to be repair or maintenance personnel. Adyen terminal maintenance staff will never arrive without prior arrangement, so check that maintenance is planned.
- Make sure that the location of the payment terminal does not allow the PIN to be observed while the customer is entering it. Pay special attention to reflective surfaces nearby, cameras, or the position of the cashier with respect to the payment terminal.
- Train your staff to instruct customers to hide their PIN while entering it on the payment terminal.