In new devices, phones, tablets, you can see the SEID number. Why do you need a SEID
Contactless NFC payments via smartphone or tablet
SEID is a Secure Element IDentifier, it is an NFC chip. The SEID is flashed into the NFC chip at the factory and is used to identify NFC equipment, it is needed to register equipment, when making contactless payments using a smartphone.
How NFC works and why you need SEID
Many have already used contactless payments when the phone replaces a payment card. To be able to make payments using a smartphone, you must configure the appropriate service. There are contactless payment systems Apple Pay, it works on devices with NFC made by Apple, Google Pay for devices running Android.
What you need to do to configure NFC payments
How do NFC payments work? If your device supports NFC, you can set up a contactless payment service. To do this, you register your device in the appropriate service (this happens automatically when the application is installed), this service is provided as a rule by the developer of operating systems, but there may be services developed by banks. Banks that work with Apple Pay or Google Pay operate in a single bank transfer payment system.
So you decided to include NFC payments on your phone, you are registered in the system. The next step is to attach a bank card to the phone. You are linking a bank card to your Apple Pay or Google Pay account. SEID is the NFC module identifier, programmatically to your card or account, the NFC chip identifier (SEID) is attached. This guarantees payment protection, a unique SEID in the NFC module and your card provide a unique cipher for payments.
How do NFC payments using SEID
In fact, the SEID is needed once when you linked the card, tokenization occurs, the creation of a virtual account in which your bank card and NFC identifier are registered. A token (one-time password) is sent by the bank during the binding of the card to the service. Having received a token, the payment service encrypts the card, binds it to SEID NFC (a virtual account is created that is tied specifically to your device), and after that you can use NFC.
During the payment, when you bring the smartphone to the NFC reader, the bank forms a request for payment. The phone, having received the request, sends a response about the identification of the payer. The virtual account number and one-time password for the payment transaction are transferred, the code is generated by the Apple Pay or Google Pay payment system. The bank, having received the response of the payment service, decrypts the information, verifies the authenticity of the payer and conducts the payment.
In different countries, payment limits are set without entering the PIN code of the card. You just need to bring the phone to the payment terminal and the payment will be completed. As an additional protection, when the payment amount exceeds the limit, you will be asked for the PIN code of the card.