POS Reader State Switching for Payment and Identity Verification

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Solution Overview

Problem

Conventional access control solutions relying on personal identification numbers (PINs) are insecure and require separate reader devices for payment and non-payment data, lacking a fail-safe mechanism for verifying employee identities and controlling operations.

Innovation Solution

A single reader device configured to read both payment and non-payment data, transitioning between states based on the type of instrument, and utilizing machine-trained models for personalized authorization recommendations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single reader device is used to read both payment and non-payment data, then device complexity is reduced, but security and reliability may be compromised due to the inability to distinguish between different data types

Engineering Contradiction:

Improvenumber of reader devicesVSAvoidauthorization accuracy

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The reader device dynamically transitions between different operational states (payment state and non-payment state) based on the type of instrument detected. This dynamic state management allows a single device to reliably handle different data types without physical separation, resolving the contradiction between device reduction and authorization accuracy.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes operational parameters (state transitions) of the reader device based on the instrument type detected. By modifying the reader's operational mode rather than its physical configuration, the system achieves reliable differentiation of data types with a single device, reducing complexity while maintaining security.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If conventional PIN-based access control is used, then ease of operation is improved, but security is weakened due to susceptibility to guessing, stealing, and sharing

Engineering Contradiction:

Improveauthorization process simplicityVSAvoidaccess control security

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The reader device acts as an intermediary that introduces instrument-based verification as an additional layer between the user and the authorization process. This intermediary mechanism enhances security by requiring physical instrument presence while maintaining ease of operation through automated state transitions and seamless integration with existing PIN-based systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If separate reader devices are used for payment and non-payment data, then reliability of data reading is improved, but device complexity and cost increase

Engineering Contradiction:

Improvedata reading accuracyVSAvoidnumber of reader devices

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The reader device is designed with universal functionality to handle both payment and non-payment instruments through state transitions. This multi-functionality allows a single device to perform roles previously requiring separate devices, reducing system complexity while maintaining reliable data reading through context-appropriate operational modes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the functionality of separate payment and non-payment reader devices into a single unified device. By combining these functions and using state transitions to manage operational context, the system achieves the reliability of specialized devices without the complexity of multiple physical units.

Inventive Principle:

Principle #5Merging (Combining)

4Ease of operation

If a single reader device transitions between states, then ease of operation is improved by reducing device count, but difficulty of detecting and measuring instrument type increases

Engineering Contradiction:

Improvesystem simplicityVSAvoidinstrument type identification

Core Design Contradiction:

Ease of operationVSDifficulty of detecting and measuring

Solution Approach 1:

The system performs preliminary detection of the instrument type before transitioning to the appropriate operational state. This preliminary action simplifies the overall process by automatically identifying the instrument type and pre-configuring the reader device, eliminating the need for manual detection or complex user input while maintaining system simplicity.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12443937B1Application state transition based on instrument type

Publication Date: 2025.10.14 BLOCK INC

AI summary

Techniques described herein are directed to point-of-sale (POS) authorization and access control. A POS application operating in a first state can send a first instruction to a reader device to prepare to read payment data associated with a payment instrument and, responsive to receiving the payment data from the reader device, can process a transaction using the payment data. In a second state, the POS application can send a second instruction to the reader device to prepare to read non-payment data associated with an identification instrument of a user and, responsive to receiving the non-payment data from the reader device, can verify an identity of the user and/or grant the user permission to perform an operation. The POS application can transition between the first state and the second state based at least in part on a type of instrument to be read by the reader device.