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Typically, the visitor ID generated for an in-app browser is different from that of a regular browser, even when these browsers belong to the same mobile device. This API informs you that operations (1) and (2) in the image come from the same mobile device. You can then use that information to personalize your user’s experience across different platforms, strengthen your fraud detection engine, understand the performance of your A/B experiments, etc. This API is intended to be used only from the server side; it was never designed to be and must not be used from the client side (i.e. browsers, mobile devices). This API is available for all of our plans. If you are interested in using this API, please contact our support team to enable it for you. Otherwise, you will receive an error.
PricingThis API is priced at an additional $1 per 1000 API calls.

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Authentication

Requests to Related Visitors API are authenticated using the Secret API key. When making a request, the HTTP Header Auth-API-Key must be set to the value of the Secret API Key. If you don’t have a Secret API Key, you can create one on your Fingerprint Dashboard by visiting App Settings > API Keys. It is also possible to authenticate the request by setting the query parameter api_key to the value of the Secret API Key. However, we strongly advise against it and recommend this approach only for quick tests. 
https://api.fpjs.io/related-visitors/someVisitorId?api_key=your-secret-api-key

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Availability

This API is available in the Global, EU, and Asia regions:
RegionBase URLServer Location
Globalhttps://api.fpjs.ioNorthern Virginia, USA
EUhttps://eu.api.fpjs.ioFrankfurt, Germany
Asiahttps://ap.api.fpjs.ioMumbai, India