Integrate FraudNet

FraudNet is a PayPal-developed, JavaScript library embedded into a merchant’s web page to collect browser-based data to help reduce fraud. Upon checkout, data elements are sent to PayPal Risk Services for fraud and risk assessment. FraudNet is for desktop browsers only.

Data collected by FraudNet is used for risk analysis and authentication. PayPal does not share FraudNet data with third parties for their own independent benefit.

To integrate FraudNet, embed a short code snippet in the merchant website and add a custom header to the PayPal call.

1. Embed FraudNet snippet

Embed a FraudNet JavaScript and noscript/ snippet into the page where you're integrating FraudNet. The integration code is based on the non-blocking script loader pattern.

JavaScript

There are 2 parts to the JavaScript snippet:

Noscript

The noscript/ snippet runs when JavaScript isn't enabled for the application. This element operates independently from the JavaScript snippet.

Parameters

The JavaScript and noscript/ snippets pass parameters to FraudNet. The s and f FraudNet parameters are required for both integrations.

Script attributes

The loading script of the JavaScript snippet uses this attribute in the <script> declaration:

Parameter attributes

The JavaScript and noscript/ snippets use these 2 attributes:

The JavaScript snippet also uses this attribute.

All other FraudNet parameters are optional.

1<script type="application/json" fncls="fnparams-dede7cc5-15fd-4c75-a9f4-36c430ee3a99">
2      {
3          "f":"<32_character_GUID>",
4          "s":"<merchant_id>_<page_id>",
5          "sandbox":false
6      }
7  </script>

1<script type="text/javascript" src="https://c.paypal.com/da/r/fb.js"></script>

1{
2  fnUrl: "https://c.paypal.com/da/r/fb.js";
3}
4function _loadFraudnetConfig(options) {
5  var script = document.createElement("script");
6  script.src = options.fnUrl;
7  document.body.appendChild(script);
8}

Modify the code

• Set a unique and random identifier for the current transaction or session in the FraudNet f parameter, also known as FraudNet Session Identifier. The maximum length of the parameter is 32 characters.
• Send the FraudNet f parameter value in the PAYPAL-CLIENT-METADATA-ID HTTP header for the Create order API request in Step 2 of the Integrate Pay upon Invoice page.
• Set a unique identifier for each web page in the FraudNet s parameter, also known as Source Website Identifier. The maximum length of the parameter is 32 characters. Use <merchant_id>_<page_id> to create unique identifiers for the s parameter. Locate these values as follows:
  • merchant_id - go to your profile and select Account Settings > Business Information > PayPal Merchant ID.
  • page_id - use one of the following values: home-page, search-result-page, category-page, product-detail-page, cart-page, inline-cart-page, checkout-page.

2. Content Security Policy integration

CSP tags

If you are using Content Security Policy (CSP), you must add the following URLs in CSP to an allowlist:

CSP scripts

If your Content Security Policy doesn't allow inline-scripts, use one of the following options:

• Add unsafe-inline as a directive in your script-src policy, such as Content-Security-Policy: script-src 'unsafe-inline'. This allows access to all inline-resources throughout your app.
• Implement a nonce value to allowlist the script.

Allowlist inline scripts

You can allowlist specific, inline scripts without using the unsafe-inline directive. Do this by using either a cryptographic nonce (a number used once) or a SHA hash.

To use a nonce, add a nonce attribute in the script tag. You must generate a nonce at random with each page load and insert it into the CSP and the FraudNet script. PayPal recommends encoding a nonce value in Base64 using a cryptographically secure random number generator with at least 128 bits of data.

Note: PayPal recommends not using a static nonce because it's less secure than using the unsafe-inline directive. If attackers use the nonce value, they can bypass all other restrictions in the CSP and execute any script they want.

1<script nonce=abcRANDOM_NONCE_VALUExyz>
2alert('Hello, world.');
3</script>
4Content-Security-Policy: script-src 'nonce-abcRANDOM_NONCE_VALUExyz'