Flash Call - confirmation code in the telephone number
A secure way to authenticate users by retrieving a password through an incoming call
How Flash Call works
The client is requested a test code, within a few seconds his phone receives a call from the number, the last digits of which are the test code. Next, the user enters the code into the authorization window or calls it the seller.
Algorithm of operation
The last 4 digits of the number from which the call comes are the code