What I would like to know is how does paypal recognize the connected device when you are making a payment, this is not really a coding question but I would like to know how it recognizes a device or what it uses to know if this device has connected before.
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If you just want to know "what's the primary/first place that currently-logged-in/last-logged-in user information is stored, the answer is cookies/in-app property storage (for web/app respectively).
Beyond that, PayPal is not going to answer this question for you. Not because security through obscurity is a be-all, end-all answer, but they have no incentive to explicitly lay out exactly what they are doing in fraud prevention. Also, the answer isn't simple and isn't fixed: they use a variety of factors and how they do it evolves as technology (and policy) change. For example you can bet that they are cross-checking things like IP addresses, UDIDs, Android Device IDs, Apple Advertising IDs, and much much more to determine if the device you are currently using is a device that has done good -- or bad -- transactions before.
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Hmm i underatand but my question was kind of from a programatic point of vue , as in when you are sending a request to paypal for a login or whatever is there something in the request that determines the device connected ? This question was for educational purposes only , I am just trying to get a global view on how that can be done – Amr El Aswar Apr 23 '15 at 22:44
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i think the process is kind of divided in to 2 phases. on the server side, you have a api that register a client device. on the client side, be it browser or android or iphone app, your client send the identification information to the server.
