2026-10-13 Author : ZCS
Android POS device management is an operational control system, not merely a button for pushing applications. It must keep every terminal associated with an owner, site, approved software state, policy, support status and retirement record. Teams still defining the wider hardware and software stack should begin with the full-stack Android POS architecture before selecting its management layer.
The term also needs a precise boundary because POS TMS, Android MDM, application stores and payment-domain management are frequently sold under overlapping labels.
Android POS device management is the control layer used to enroll, identify, configure, monitor, update, support and retire business terminals. It governs devices, operating-system builds, applications and policies across a fleet. It does not process orders, settle payments or replace the acquiring, fiscal and business systems running around each terminal.
That definition changes the buying question. Instead of asking whether a supplier “has TMS,” a buyer should ask which objects the platform controls, which actions it can perform, which failures it can recover from and which evidence proves those functions on the exact terminal configuration.
Android POS device management keeps a distributed hardware fleet in a known and supportable state. The managed estate may include handheld POS terminals, countertop registers, kiosks, ticket validators, inventory devices and customer-facing displays. The required controls depend on whether a device runs a business application, a certified payment application or both.
A useful platform maintains more than a device list. It should connect each physical unit to a lifecycle record containing its serial number, model, hardware revision, Android build, firmware, management-agent version, installed applications, assigned merchant, deployment location, policy group and current disposition.
The lifecycle begins before the terminal reaches a store. A unit may move through factory stock, staging, customer assignment, shipment, activation, operation, repair, spare inventory and retirement. The management record should preserve that progression because an unassigned or returned unit must not continue receiving a live merchant configuration.
A POS application manages commercial workflows, while the management platform manages the device running those workflows. Products, prices, orders, employees, inventory, receipts and settlement records belong to the business or payment application. Firmware versions, application packages, kiosk policy, device health and remote support actions belong to device management.
The distinction matters during an incident. A terminal can be online in the TMS but unable to reach the order server. It can complete a sale while remaining behind on an approved firmware version. It can also show a healthy Android process while its printer is out of paper or its payment application is not activated.
A green online icon does not prove that a terminal is ready to trade. Readiness normally requires several simultaneous conditions: the expected firmware is installed, required applications are active, configuration matches the assigned site, peripherals respond, network endpoints are reachable and no security policy has been violated.
Procurement requirements should therefore define a target state and the evidence used to establish it. An operator should be able to distinguish “connected,” “compliant,” “transaction-ready,” “degraded,” “under repair” and “retired” rather than treating every device as simply online or offline.
The correct platform depends on the control boundary, not the product label. Some POS TMS products include general Android policies. Some enterprise mobility management platforms support dedicated POS deployments. An application marketplace can distribute software but may not control firmware, hardware telemetry or terminal-specific parameters.
| Control layer | Primary responsibility | Typical functions | Functions that need a separate authority |
|---|---|---|---|
| POS TMS | Terminal-specific lifecycle and software state | Enrollment, device groups, firmware, parameters, terminal monitoring and remote support | Order processing, acquiring and settlement |
| Android MDM or EMM | General Android device and application policy | Kiosk mode, application restrictions, Wi-Fi, VPN, certificates, password and device policy | Payment keys, acquiring approval and payment routing |
| Enterprise app store | Application publication and lifecycle | Submission, approval, channels, installation, update and withdrawal | Complete firmware and device-security control |
| Payment-domain management | Approved payment application and terminal estate | Payment parameters, terminal identifiers, approved versions and controlled operational functions | General employee apps and unrelated business content |
| Remote key management | Cryptographic-key lifecycle | Secure injection, distribution, rotation, revocation and audit | Ordinary APK delivery and Android UI policy |
The boundary becomes clearer when each platform is described as an authority over named objects.
A POS TMS controls terminal-specific state such as firmware, peripheral configuration and approved application combinations. An Android MDM controls broader operating-system and enterprise policies. An app store controls software publication. Payment and remote-key systems retain separate authority over transaction parameters, cryptographic material and regulated payment operations.
The practical result is that one product may implement several rows in the table, but a project still needs separate permissions, logs and acceptance tests for each row.
A purpose-built POS TMS may offer the only supported path to manufacturer firmware and hardware services. A general MDM may offer stronger Android Enterprise policy coverage, identity integration, certificate deployment or management across phones, tablets and POS terminals from different vendors.
Some fleets need only one platform. Others use a manufacturer TMS for firmware and terminal diagnostics while an enterprise MDM controls kiosk policy, corporate networks and business applications. Dual-platform deployments require a written ownership map so that two systems do not repeatedly overwrite the same setting or trigger conflicting installations.
Application distribution covers only part of the device lifecycle. A store can approve an APK, publish it to a channel, install it silently and record the result. It may not know whether a printer service is compatible, whether a firmware prerequisite exists or whether the installed application can complete a real transaction.
Release governance must connect the package channel with device groups, prerequisite versions, installation windows, functional health checks and withdrawal rules. The platform should also distinguish download, installation, activation and business readiness rather than reducing all four states to “deployed.”
General device administrators should not receive payment-domain authority by default. Payment application configuration, merchant and terminal identifiers, acquiring endpoints, security keys and certification-controlled versions may require different systems, operators and approvals.
A capability matrix should identify whether the management platform merely reports payment-application status or can change payment parameters. It should also state which actions require an acquirer, payment service provider, key-management service or authorized technician.
Reliable fleet management begins with trusted enrollment and a durable device identity. The platform needs to know which physical terminal is connecting, who owns it, which organization may administer it and which initial policy it should receive.
Android supports fully managed dedicated devices intended for focused employee-facing or customer-facing functions. The official Android dedicated-device guidance describes lock task mode, managed applications, OTA freeze periods and provisioning methods including QR enrollment. These Android capabilities are relevant to POS, but actual availability still depends on the terminal build, management software and Google-services configuration.
A single serial number is not enough to describe a working POS deployment. The enrollment record may need the manufacturer serial number, internal asset ID, hardware revision, network identifiers, merchant or customer account, store, lane, country, device role and expected software channel.
Each identifier needs an owner and change rule. A device can move between stores without changing serial number. A replacement device can assume a lane role without inheriting the failed unit’s cryptographic identity. A factory-reset device can retain its asset record while requiring fresh management authentication.
The best enrollment method is the one supported by the actual procurement and staging flow. QR provisioning can work for newly reset Android devices. Official Android zero-touch enrollment can reduce manual setup for eligible devices purchased through supported channels. Factory enrollment can preload a management agent or configuration, while identifier-based enrollment may require an installer to enter a token.
The workflow should document who generates the enrollment material, how long it remains valid, whether it can be reused, and what prevents one customer from enrolling another customer’s terminal. A pilot must also cover failed enrollment, interrupted setup and devices delivered with the wrong assignment.
Android Enterprise terminology does not guarantee identical behavior on every Android POS build. A GMS-certified device may support managed Google Play and standard enterprise provisioning paths. A non-GMS device can still be remotely managed, but it may depend on a manufacturer agent, private application repository or proprietary enrollment flow.
According to the Android Developers dedicated-device documentation updated in March 2026, Android management can use a custom device policy controller, Android Management API or a third-party EMM. Buyers should confirm which option is implemented, which Android versions are covered and which services the deployment requires.
Groups turn individual terminals into a controllable fleet. A useful group model can target an action without forcing an administrator to select devices manually or expose an unrelated customer to the change.
A terminal may need attributes for customer, country, region, store, role, model, hardware revision, application channel, firmware channel, payment profile, support state and pilot status. The management platform should explain whether these attributes can be combined dynamically or whether a device belongs to only one fixed group.
Overlapping groups create risk when their policies conflict. A country group may require one network profile, a merchant group another application version and a pilot group a newer firmware. The platform needs a documented precedence model or a conflict detector that shows the effective configuration before publication.
Administrators should be able to preview the exact target set and effective policy. A release approval should record that resolved population rather than only the original group name, because membership can change between scheduling and execution.
Google provides the Android Management API as one route for enterprise mobility management providers to apply policies and manage Android devices. Its presence does not make manufacturer firmware, privileged POS services or model-specific peripheral telemetry portable; those functions still depend on the terminal implementation and commercial management arrangement.
A multi-tenant platform must isolate actions and data, not merely hide rows in the interface. A distributor, payment provider or ISV may manage several merchant organizations through one service, while each merchant sees only its own devices and authorized functions.
Isolation should cover device records, applications, firmware channels, configuration values, reports, exported logs, API credentials and administrative actions. Shared support personnel need controlled cross-tenant access with a business reason, limited duration and an auditable record.
Multi-country management needs explicit regional attributes. Time zones affect maintenance windows; languages affect interfaces and receipts; network providers affect connectivity; data-residency rules affect telemetry storage; and approved software combinations may differ by market.
The platform should prevent a package intended for one region from reaching another merely because the devices share a model. Country and regulatory profiles are therefore release controls, not descriptive labels.
Remote application deployment needs a governed release lifecycle. Uploading an APK is only the first step. The operator should know who submitted it, who approved it, which signature and checksum were verified, which devices are eligible, when it will install and what proves that it works.
The lifecycle should include submission, automated checks, human approval, channel assignment, pilot deployment, scheduled installation, activation monitoring, withdrawal and end-of-life removal. Each transition needs an owner and audit record.
A package should declare its compatible environment before it reaches a terminal. Relevant prerequisites can include model, hardware revision, minimum firmware, Android API level, device-service version, available storage, battery state and required peripheral option.
These controls connect fleet operations with application engineering. The Android POS SDK integration guide explains why an application, manufacturer service, firmware and peripheral form a tested version tuple. Device management should preserve that tuple rather than updating one component in isolation.
Configuration is deployable software state even when it is stored as text. Network endpoints, feature flags, receipt templates, language settings, scanner behavior and application parameters can stop a terminal just as effectively as a broken APK.
Every configuration release should therefore have a version, owner, target group, validation status, activation time and rollback rule. Secrets should not be embedded in ordinary configuration packages, and regulated payment parameters should remain inside their authorized management boundary.
The management agent can report a successful install while the business remains unavailable. An application may crash at startup, fail to bind to a printer service, reject its database schema, lose a required permission or connect to the wrong environment.
Post-installation checks should confirm process health, expected version, required service bindings and a small set of non-destructive functional signals. For high-risk releases, a controlled transaction or peripheral test on pilot devices provides stronger evidence than an installation receipt alone.
A firmware OTA process must limit the number of terminals exposed to an unknown failure. The safest release is progressive, observable and reversible where the platform and package design permit reversal.
A practical sequence moves from laboratory devices to internal production-like units, a representative pilot group, a limited live cohort, regional expansion and finally the wider estate. Each stage has an entry criterion, monitoring period and promotion decision.
The release process can be summarized in one operational rule.
Safe POS firmware OTA deployment moves a signed package through laboratory, internal, pilot, limited-production and fleet-wide stages. Each stage defines eligible devices, maintenance windows, minimum battery and storage, health signals, acceptable failure rates, stop conditions and recovery actions before a larger terminal population becomes exposed.
This structure makes an update auditable even when no rollback image is available.
A rollout cannot be controlled if success means only “the command was sent.” Useful states include queued, downloading, downloaded, verifying, installing, rebooting, reconnected, activated, healthy, failed, recovered and pending manual service.
Promotion criteria should combine technical and business evidence. The fleet may require an installation-success threshold, a maximum reboot loop count, stable connectivity, application startup, peripheral readiness and no material increase in support incidents.
A global timestamp is not a complete maintenance policy. Store hours, time zones, battery charging patterns, network costs and regional holidays affect when a terminal can accept a large package or restart safely.
The platform should calculate the applicable local window, show which devices missed it and define whether the job expires or waits for the next window. Mobile terminals that remain powered off overnight may require a different strategy from fixed checkout devices connected continuously.
Rollback restores a previous version, while recovery returns a failed device to a usable state. Not every firmware change is safely reversible. Partition changes, bootloader updates, data migrations and security version constraints may make a direct downgrade unsupported.
The release plan should state whether rollback is technically supported, which state is preserved, who can authorize it and how long the previous package remains available. When rollback is impossible, the project needs an alternate recovery image, service mode, local procedure or device replacement path.
Teams cannot assess update exposure without a current hardware and software inventory. NIST’s enterprise patch-planning guidance treats patching as preventive maintenance and emphasizes enterprise planning rather than isolated installation. For POS fleets, the inventory must connect vulnerabilities and approved fixes with the terminal configurations that actually contain the affected component.
An Android security update, manufacturer service update, payment application release and business-app patch can follow different approval paths. The management plan should show which party owns each path and which combined versions have been tested.
Offline devices turn a scheduled release into a delayed-state problem. A terminal can reconnect after the campaign has ended, after a newer version has been approved or after it has been reassigned to another customer. Blindly executing every queued command can install stale or dangerous state.
Every queued action should have an identifier, target-state assumption, prerequisite version, creation time, expiry time and idempotency rule. On reconnection, the platform should recalculate the desired state rather than replay an obsolete history mechanically.
The platform must decide whether a terminal can skip intermediate releases. A device several versions behind may support a direct update, require a defined upgrade chain or need manual recovery. The rule should be based on tested package paths rather than assumed from version numbers.
The console should show why a device remains behind: offline, insufficient storage, low battery, incompatible prerequisite, failed verification, user deferral or unsupported path. These categories lead to different remediation actions.
Download interruption and installation interruption are different failures. A resumable download may continue safely after connectivity returns. Power loss during installation may require an alternate partition, verified boot recovery or local service.
Operations teams need to know the last confirmed stage and whether the terminal can still trade. A device that remains on the old version after a failed download is a different operational case from one that cannot boot after installation began.
A returned or reassigned device must not receive commands from its previous tenant. Decommissioning should cancel queued work, revoke credentials, remove merchant assignments and record the final policy state before repair, resale or disposal.
Replacement workflows need similar care. A new device may inherit the store and application profile, but it should receive a new device identity and its own audit trail rather than impersonating the failed terminal.
Monitoring is valuable only when a signal leads to a defined decision. Collecting every available field increases cost and privacy exposure without guaranteeing faster support.
| Monitoring layer | Useful examples | Operational question |
|---|---|---|
| Connectivity | Last contact, network type, repeated disconnects | Is the unit reachable within its expected operating pattern? |
| Software | Android, firmware, agent, service and app versions | Does the terminal match an approved version tuple? |
| Device health | Battery, storage, temperature indicators and reboot events | Is failure likely or already affecting availability? |
| Peripherals | Printer, scanner, display and reader status where supported | Which physical function is degraded? |
| Deployment | Download, install, activation and health-check results | Where did the release stop? |
| Security | Policy deviation, debugging state and unapproved apps | Has the terminal left its controlled operating state? |
| Lifecycle | Stock, staged, deployed, spare, repair and retired | Should the device still receive production policy? |
An alert without an owner is only stored noise. Every material condition needs severity, response time, escalation path and closure evidence. Different groups can use different thresholds because two hours offline may be normal for a rural mobile terminal and critical for a continuously staffed checkout.
Fleet-level correlation is more useful than repeated device alerts. When many terminals lose contact after the same release, the likely problem is different from one unit with a damaged radio or depleted battery.
Device management should collect the minimum data required for operations. Transaction values, cardholder information, customer identities and receipt contents do not automatically belong in a TMS simply because the terminal processes them.
If transaction-derived health metrics are required, the architecture should define aggregation, masking, retention, access and regulatory scope. A count of successful application health checks is materially different from a feed of transaction records.
Remote logs can narrow a fault but cannot repair broken hardware. A paper-door latch, worn print head, cracked display, depleted battery or tampered enclosure still needs inspection, repair or replacement.
The management record should therefore connect to support ownership, warranty state, spare-parts availability and return authorization. Remote diagnosis creates value when it reduces unnecessary visits or tells a technician which replacement part to bring.
Central fleet control concentrates operational power and needs stronger governance than an ordinary dashboard. An administrator able to publish firmware or change every terminal configuration can create a fleet-wide outage with one action.
Role-based access should separate viewing, support, application publication, firmware release, policy administration, tenant management and security review. High-impact actions may require a second approver or a time-limited elevation.
A useful audit record answers who, what, where, when and result. It should identify the operator, approved artifact, target population, effective devices, schedule, policy change, platform response and final outcome.
Logs also need integrity protection, retention rules, export controls and a consistent time source. Screenshots of a successful dashboard are not substitutes for machine-readable evidence that can support incident analysis or customer reporting.
The terminal should accept only authenticated artifacts from an authorized channel. Package signing, checksum verification, protected transport and server authentication reduce the risk of corruption or unauthorized software distribution.
These controls sit inside a broader POS security control framework. A TMS can enforce device policy and preserve evidence, but it does not by itself make a merchant PCI DSS compliant, certify a payment application or secure every backend connected to the terminal.
Cloud, private and hybrid deployments create different operational responsibilities. A managed cloud service can reduce infrastructure work, while private deployment can satisfy contractual, network or data-location requirements. Private hosting also transfers maintenance, backup, monitoring and disaster-recovery obligations to the operator.
The buyer should ask where device records, locations, logs and administrator identities are stored; which subprocessors can access them; how backups are protected; how data is exported; and what happens when the service contract ends.
Scale changes the cost of manual work and the potential impact of one mistake. Device count is not the only variable, but it provides a useful way to expose which controls become necessary as the estate grows.
The operational progression can be stated without assuming one universal staffing ratio.
A 100-device fleet can operate with disciplined inventory, fixed groups and scheduled releases. A 1,000-device fleet needs automation, APIs, delegated roles and limited release cohorts. A multi-country fleet additionally needs regional administrators, local maintenance windows, country-specific configurations, data boundaries and governance that prevents cross-market deployment errors.
The thresholds are planning examples rather than claims that every fleet changes at exactly the same number.
| Deployment profile | Primary risk | Minimum management controls |
|---|---|---|
| Around 100 devices | Losing inventory and version consistency | Trusted enrollment, ownership records, fixed groups, remote logs and staged updates |
| Around 1,000 devices | Manual workload and large failure radius | APIs, dynamic grouping, pilot channels, delegated RBAC, automated compliance reporting and alert ownership |
| Multiple customers | Cross-tenant access or deployment | Tenant isolation, scoped credentials, separate application channels and support-access audit |
| Multiple countries | Wrong regional configuration or update timing | Country profiles, regional roles, local windows, data-location controls and release partitions |
Automation should replace repetitive selection, not bypass approval. APIs can synchronize asset records, assign devices, create groups, retrieve deployment results and open support cases. They should use scoped credentials, rate limits and the same authorization and audit model as the console.
The platform should explain whether an API exposes desired state, current state or both. An automation that sends commands without confirming convergence can reproduce manual errors faster.
Regional variation should be managed through governed profiles rather than copied projects. The existing multi-country TMS configuration guide explores market-specific firmware, language, network and application planning. Its regional detail complements the platform-selection and control-boundary focus of this article.
Any model-specific or platform-specific capability described in a multi-country plan still needs evidence. Buyers should validate the exact firmware targeting, rollback, telemetry and partitioning behavior on a pilot fleet rather than treating “TMS supported” as proof of every advanced function.
A procurement team should convert management claims into a capability-and-evidence matrix. Each requirement needs an exact scope, supported configuration, demonstration method, owner and acceptance result.
| Evaluation area | Questions to ask | Evidence to request |
|---|---|---|
| Supported estate | Which models, revisions, Android builds and agents are supported? | Versioned compatibility matrix |
| Enrollment | Which factory, QR, token or zero-touch paths work? | Reset-to-enrolled demonstration |
| Identity | How are customer, site, role and asset records linked? | Device data model and export |
| Grouping | Can policies target dynamic attributes and combined conditions? | Effective-policy preview |
| Application lifecycle | Are approval, pilot, scheduling, withdrawal and EOL supported? | Application-channel workflow |
| Firmware OTA | What are prerequisites, stages, stop conditions and recovery paths? | Failed-update demonstration |
| Monitoring | Which metrics are actual, inferred or unavailable by model? | Model-specific telemetry matrix |
| Roles | Can high-impact permissions and tenants be separated? | RBAC matrix and approval flow |
| Audit | Can actions and results be exported and retained? | Sample audit record |
| API | Which objects and actions are available? | API documentation and scoped test credentials |
| Deployment | Cloud, private or hybrid; where is data stored? | Architecture, backup and recovery documents |
| Support | Who owns failed releases and agent compatibility? | SLA, escalation and lifecycle policy |
Management capability is part of the terminal configuration, not a detached software promise. The agent may depend on system privileges, signed firmware, preinstalled services or manufacturer APIs. An otherwise capable MDM cannot create hardware telemetry that the terminal does not expose.
The Android POS manufacturer checklist provides the wider supplier audit covering Android maintenance, SDK evidence, quality controls, spares and support. The device-management evaluation should reuse the same exact model, hardware revision and firmware identifiers.
A mature platform should make its scope understandable before a production order. Useful material includes a capability matrix, architecture diagram, supported-version table, administrator guide, API catalog, security overview, release history and clear support process.
The evidence packet should also explain which functions are standard, licensed, optional or project-specific. It should name the supported server and agent versions, hosting responsibility, backup method, maintenance schedule, log-retention period, API limits and escalation route. A buyer can then distinguish an available production capability from a roadmap item, custom engineering option or sales demonstration.
Operational evidence should be reproducible. Ask for a guided test account or supervised demonstration using the quoted model, then export the device record, deployment result and audit trail. If confidential information prevents broad documentation, the supplier can still provide a controlled capability matrix and redacted evidence without making unverifiable fleet-wide claims.
ZCS presents TMS as part of its Android POS technical-support offering, but buyers should request project-specific confirmation of supported models, deployment mode, telemetry and remote actions. The relevant TMS remote device deployment discussion belongs after requirements are defined, so the inquiry can name the evidence and demonstrations required.
The platform with the longest feature list is not necessarily the safest operational fit. Buyers should map who publishes applications, signs firmware, operates infrastructure, approves releases, supports merchants, investigates incidents and maintains compatibility after Android or hardware changes.
The selected model can be vendor-operated, enterprise-operated or shared. The contract should state which team owns each failure path and what evidence transfers if the operator or platform changes.
A pilot should prove that the fleet can be controlled when events do not follow the happy path. A successful bulk update demonstrates only one narrow condition.
Use production-like devices, peripherals, applications and networks. Record model, revision, Android build, firmware, agent, service, application and management-platform versions for every test.
Every test needs a pass condition and evidence owner. “Works” should be replaced with observable criteria such as correct target count, rejected unauthorized action, successful health check, preserved application data or documented recovery state.
The final acceptance record should list limitations as well as passed functions. A platform can still be suitable when one feature is unavailable, provided the operating model includes a safe alternative and the commercial scope reflects that limitation.
Android POS device management is the control layer for enrolling, configuring, monitoring, updating, supporting and retiring Android-based business terminals. It manages device and software state rather than products, orders, settlement or acquiring.
A POS TMS focuses on terminal-specific firmware, parameters, hardware status and lifecycle, while Android MDM focuses on broader operating-system, application and enterprise security policies. One platform may contain both feature sets, so buyers need a capability matrix rather than relying on the label.
Cross-brand management is possible only for functions exposed through supported agents, Android management frameworks or platform integrations. General policies and applications may work across brands, while manufacturer firmware, privileged services and hardware telemetry usually remain model-specific.
Not necessarily. Cryptographic-key injection, distribution, rotation and revocation commonly belong to a dedicated remote key-management system and authorized payment-security process. A TMS may integrate with or report status from that system without controlling the keys itself.
Move the release through laboratory, internal, pilot, limited-production and broader fleet stages. Define prerequisites, maintenance windows, health signals, failure thresholds, stop conditions and recovery actions before each stage begins.
Yes, but the platform should reevaluate the desired state when the device reconnects. A queued command needs prerequisites and an expiry rule so a reassigned device does not install an obsolete or wrong-tenant package.
It should isolate devices, applications, firmware channels, configuration, administrator roles, API credentials, reports, logs and exported data. Temporary cross-tenant support access should be limited and audited.
No. Support depends on device eligibility, procurement channel, Android build, Google-services configuration and management platform. The production enrollment flow must be tested on the exact model and firmware being ordered.
Private deployment may be required by data-location rules, customer contracts, restricted networks or infrastructure policy. It also makes the buyer responsible for hosting, security, monitoring, backup, upgrades and disaster recovery.
Test enrollment, grouping, application deployment, OTA failure, offline recovery, permissions, tenant isolation, audit export, replacement and retirement. Failure-and-recovery evidence is more valuable than a dashboard demonstration showing one successful update.
Choose an Android POS device management platform by control coverage, failure containment and lifecycle evidence. First define which system owns firmware, Android policy, applications, payment parameters and keys. Then verify enrollment, grouping, staged release, monitoring, recovery, roles, audit and retirement on the exact supported terminal configuration.
The final purchase decision should approve an operating model rather than a feature list. That model identifies the device and software versions in scope, the team responsible for each action, the evidence required for release, the response to failure and the path for exporting records or changing platforms later.
Home 
How ISVs Integrate Printers, Scanners, NFC and Customer Displays Through a POS SDK? 
