Authorize.net uses industry-standard security, but safety depends on how you set it up

Authorize.net is owned by Visa and uses encryption, fraud detection, and PCI compliance to protect payment data. The platform itself meets the security standards required to handle credit cards. However, "safe" also depends on your own setup: whether you use their latest tools, keep your account credentials secure, and follow their recommended practices. A merchant using Authorize.net with weak passwords and outdated integration methods faces more risk than one using their current security features.

The company has been processing payments since 1996 and handles millions of transactions annually. They maintain PCI DSS Level 1 compliance, the highest standard for payment processors. That means they undergo regular third-party security audits and must meet strict data protection rules. But compliance is a floor, not a may provide — it means they meet minimum standards, not that fraud or breaches are impossible.

Key Takeaways

  • Authorize.net is owned by Visa and maintains PCI DSS Level 1 compliance, the highest security standard for payment processors.
  • The platform encrypts payment data in transit and uses tokenization to avoid storing full card numbers on your servers.
  • Your own security matters as much as theirs: weak passwords, outdated integrations, and shared credentials create real risk even on a secure platform.
  • Authorize.net has experienced breaches in the past, most recently a 2013 incident, though no major breaches have been publicly disclosed since.
  • You can reduce risk by using their hosted payment forms, enabling two-factor authentication on your merchant account, and monitoring transaction reports regularly.

How Authorize.net protects payment information

Authorize.net encrypts all payment data using TLS (Transport Layer Security) while it moves between your website and their servers. This means card numbers and other sensitive details are scrambled in transit and cannot be read if intercepted. The company also uses tokenization, which replaces the actual card number with a unique token that you store instead. If someone breaches your database, they get the token, not the card number — and the token is useless without Authorize.net's decryption key.

The platform includes Advanced Fraud Detection Suite, which flags suspicious transactions based on patterns like unusual geographic location, mismatched billing and shipping addresses, and velocity (too many charges in a short time). You can set rules to automatically decline, hold for review, or accept these flagged transactions. This is not foolproof — fraud detection catches patterns, not every instance — but it reduces the number of fraudulent charges that reach your customers.

Authorize.net also offers Customer Information Manager (CIM), which stores payment profiles securely so customers do not have to re-enter card details on repeat purchases. The stored profile contains only the token and last four digits of the card, not the full number. This reduces the number of times card data passes through your systems.

Where your own security matters most

Authorize.net's security is only as strong as the weakest link in your setup. If you use their hosted payment forms — pages that Authorize.net hosts and controls — the card data never touches your server at all. This is the safest option because your infrastructure cannot be breached to steal card numbers. If instead you build your own payment form and send card data to Authorize.net, you become responsible for securing that data in transit and at rest.

Your merchant account credentials are another critical point. If someone gains access to your API login ID and transaction key, they can process charges, refund money, or pull transaction data. Use a strong, unique password for your Authorize.net account. Enable two-factor authentication if available (check your account settings). Do not share credentials across team members — create separate logins for each person who needs access, so you can revoke individual accounts if someone leaves.

Outdated integrations also create risk. If you built a payment integration years ago and have not updated it, you may be using deprecated methods that Authorize.net no longer recommends. Check your integration against their current documentation. If you use a third-party shopping cart or plugin (WooCommerce, Shopify, custom software), keep that software updated — developers patch security holes regularly, and old versions are vulnerable.

Authorize.net's history with breaches and incidents

Authorize.net experienced a significant breach in 2013 when attackers gained access to a database containing payment card information. The company discovered the breach, notified affected merchants, and worked with law enforcement. Since then, no major public breaches have been disclosed, though like any large payment processor, Authorize.net is a target for attackers and the company does not disclose every security incident.

The 2013 breach led to increased scrutiny and investment in security. Authorize.net strengthened encryption, improved monitoring, and increased audit frequency. The incident also reinforced why using hosted payment forms and tokenization matters — merchants whose data never touched their own servers were not affected by the breach.

You can check whether your account was involved in any known incidents by searching your email for breach notifications from Authorize.net or by contacting their support. If you were affected by the 2013 breach, you would have received notification at the time.

What PCI DSS Level 1 compliance actually means

PCI DSS (Payment Card Industry Data Security Standard) is a set of rules created by Visa, Mastercard, American Express, and Discover. Level 1 is the highest tier, required for processors handling millions of transactions annually. It means Authorize.net must undergo annual third-party audits, maintain a firewall, encrypt data, restrict access to card data, monitor networks for intrusions, and maintain security policies.

Compliance does not mean breaches cannot happen — it means the company has controls in place and is regularly tested. A Level 1 processor has more security infrastructure than a smaller processor with lower compliance requirements. But compliance is a baseline. Authorize.net could be fully compliant and still experience a breach if attackers find a zero-day vulnerability (a flaw unknown to the company and the security community).

As a merchant, you are also responsible for PCI compliance. If you store card data on your own servers, you must meet PCI standards too. Using Authorize.net's hosted forms or tokenization reduces your PCI burden because the sensitive data stays with them, not with you.

Steps to reduce your risk when using Authorize.net

Start by using hosted payment forms instead of building your own. Authorize.net's Accept Hosted or Accept.js solutions keep card data off your servers entirely. If you must build a custom form, use Accept.js, which tokenizes the card before it reaches your code.

Enable two-factor authentication on your merchant account. Log into your Authorize.net dashboard, go to Account Settings, and look for security options. Set up a strong, unique password — do not reuse passwords from other sites. Create separate user accounts for each team member with only the permissions they need (for example, a customer service rep does not need access to refund settings).

Monitor your transaction reports regularly. Authorize.net's dashboard shows all charges, refunds, and disputes. Set aside time weekly to scan for unauthorized activity. If you see charges you did not process, report them immediately to Authorize.net support.

Keep your integration updated. If you use a plugin or shopping cart, update it when new versions are released. If you built a custom integration, review Authorize.net's API documentation annually to ensure you are using current methods. Deprecated methods may lack newer security features.

Use tokenization for repeat customers. Store the token, not the card number. This reduces the data you hold and lowers your PCI compliance burden. Authorize.net's CIM handles this automatically if you enable it.

Comparing Authorize.net to other processors on security

Authorize.net, Stripe, Square, and PayPal all maintain PCI Level 1 compliance and use encryption and tokenization. The main differences are in ease of use and integration options, not in baseline security. Stripe and PayPal are known for developer-friendly documentation. Square is simpler for in-person payments. Authorize.net has been around longer and integrates with more legacy systems.

All of these processors have experienced breaches or security incidents at some point. Security is not a differentiator between them — they all meet the same standards. Your choice should depend on features, pricing, and integration needs, not on the assumption that one is inherently safer than another. Your own setup and practices matter more than which processor you choose.

Frequently Asked Questions

Can someone steal card numbers from Authorize.net's servers?

Authorize.net stores card data encrypted and tokenized, so a breach would expose tokens and encrypted data, not readable card numbers. However, no system is completely breach-proof. If you use hosted payment forms, card data never reaches Authorize.net's servers in the first place — it stays encrypted in their payment gateway. This is the lowest-risk setup.

What should I do if I think my Authorize.net account was compromised?

Change your password immediately and enable two-factor authentication if you have not already. Review your transaction history for unauthorized charges. Contact Authorize.net support and report the suspected compromise. They can audit your account activity and help you identify any fraudulent transactions. If customers were affected, you may need to notify them and offer fraud monitoring.

Do I need to be PCI compliant if I use Authorize.net?

If you use Authorize.net's hosted payment forms or Accept.js, card data does not touch your servers, so your PCI compliance burden is minimal — you just need basic security practices like firewalls and strong passwords. If you build a custom form and handle card data yourself, you must meet PCI DSS standards, which is more complex and expensive. Using hosted forms is simpler and safer.

Is it safe to store Authorize.net API credentials in my code?

No. Never hardcode API credentials in your application code or configuration files. Store them in environment variables or a secure secrets manager that your code reads at runtime. If your code is ever exposed (through a public GitHub repository, for example), attackers can use those credentials to process charges on your account. Rotate your API keys regularly and revoke old ones.

What happens if a customer disputes a charge processed through Authorize.net?

Authorize.net handles the technical side of the dispute, but you are responsible for responding. The customer's bank initiates a chargeback, and Authorize.net notifies you. You have a window (usually 7 to 10 days) to provide evidence that the charge was legitimate — order confirmation, shipping proof, customer communication, or a signed receipt. If you do not respond or your evidence is weak, you lose the dispute and the charge is reversed.