To sell a .NET desktop app, choose where to distribute it, define what a purchase entitles the customer to, and make fulfillment and license validation separate, reliable steps. The Microsoft Store can handle much of distribution and sales operations; selling directly gives you more control but makes you responsible for checkout integration, signing, hosting, and updates. For a custom license, create entitlements on a server after confirmed payment, then let the app validate them without embedding any server-side signing secret in the client.
Choose how customers will buy and install the app
The Microsoft Store and direct sales are different operating models, not merely alternative checkout buttons. Microsoft describes the Store as its recommended route for most developers, while direct downloads can suit commercial ISVs and other cases the Store does not fit. See Microsoft’s publishing overview and its Store distribution guidance.
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| Decision | Microsoft Store | Direct sale and distribution |
|---|---|---|
| Sales operations | The Store offer includes revenue processing, refunds, and analytics. Details depend on the current Store terms. | You operate the storefront and must confirm that your chosen provider supports the payment, fulfillment, refund, and tax workflows you need. |
| Licensing | The Store app-license API exposes app and add-on licensing state, including cached information when offline. | You choose or build entitlement issuance and validation. .NET’s LicenseProvider is a component hook, not a complete licensing or commerce service. |
| Signing and updates | For MSIX distribution through the Store, Microsoft re-signs packages and provides Store-managed updates. | You handle package signing, hosting, and updates, and must protect signing credentials. |
| Operational control | The Store provides a managed distribution route and discovery. | You control the storefront and release process, while taking on more operational work. |
These distinctions are described in Microsoft’s publishing documentation and its Store distribution documentation. Confirm current features and terms before choosing a route.
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Choose the Store when managed distribution fits
If Store distribution fits your audience and commercial model, the platform can reduce the work of hosting, updates, and sales administration. Store licensing also has a platform API, so the app can check its Store entitlement rather than asking your own service to issue a separate key.
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Choose direct sales when you need publisher control
Direct distribution may fit a commercial release that does not suit Store requirements or needs a publisher-controlled sales and release process. Budget for the responsibilities that come with it: payment confirmation, entitlement fulfillment, refunds and support policy, package signing, hosting, and updates. The exact capabilities of any checkout provider or licensing service must be verified with that vendor; they are not interchangeable or guaranteed by .NET.
Define exactly what a purchase grants
Before implementing checkout or generating keys, write down the entitlement represented by a successful purchase. These are product-policy decisions; a payment provider does not automatically decide them for you.
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- Product and edition: identify the app, edition, and any add-ons included.
- Seats and devices: state whether a purchase is for one person, a team, or a specified device count.
- Duration: distinguish a perpetual entitlement from a subscription or time-limited license.
- Upgrades: explain whether major-version upgrades are included.
- Transfer and rehosting: define how customers move a license to another computer or restore it after a reinstall.
- Refunds and chargebacks: specify what happens to the entitlement if a payment is refunded or reversed.
- Offline use: state how long an app can work without contacting a licensing service, if you set a grace period.
Use plain language customers can find before purchase. These rules also determine what your licensing system must store and how support can resolve account or device changes.
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For a direct sale, connect the storefront’s verified payment event to server-side entitlement creation and delivery. Do not treat a return from a checkout page, an email address, or a client-side success message as proof of payment. The authoritative flow belongs on a server you control or a verified service you have selected.
- Receive confirmation: accept the provider’s verified payment notification or reconcile the transaction through its documented server-side process.
- Create the entitlement: record the product, customer or account, purchase status, and the policy details needed for validation and support.
- Issue and deliver: create a license credential or account entitlement and deliver it through a suitable channel, such as the customer’s account or purchase email.
- Handle later changes: update or revoke entitlement according to your stated refund, chargeback, transfer, and renewal rules.
The appropriate payment event, verification method, and license delivery features depend on the vendor. Confirm those details in the provider’s current documentation before building the integration; no particular checkout provider or license service is established here as a recommendation.
Validate the right kind of license in the app
For a Microsoft Store app, query the Store license
For Store-distributed apps, use the Store licensing API rather than inventing a separate key flow by default. StoreContext.GetAppLicenseAsync returns license details for the current app, including add-ons, and can return cached license information when the device is offline. See Microsoft’s StoreContext.GetAppLicenseAsync API reference. Decide how your app behaves if it has only cached state or cannot refresh the license.
For custom licensing, keep issuance authoritative and validation local
In a direct-sale design, the server should remain authoritative for issuing or changing an entitlement. A practical architecture is to have the server issue a signed entitlement and have the desktop app verify it using a public verification key. Never ship the server-side signing secret in the desktop client: users control the client and can inspect or modify it. This is an architectural recommendation, not a Microsoft-prescribed license-key format.
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Keep package trust and paid entitlement separate. A valid code signature helps establish that a package came from the publisher and has not been altered; it does not prove that a customer has paid for a license. The app’s entitlement check must answer that separate question.
Use LicenseProvider only for component licensing
.NET’s LicenseProvider is an extension point for licensing components, not a storefront, key generator, or hosted entitlement service. Microsoft’s API documentation says: “When you inherit from LicenseProvider, you must override GetLicense(LicenseContext, Type, Object, Boolean) to implement a validation method for the license key.” See the LicenseProvider API reference. Implementing that validation is your responsibility; it does not by itself license an entire desktop product or fulfill a purchase.
Make offline access and recovery explicit
Offline behavior is part of the entitlement design. A cached license can keep an app usable without a connection, but customers also need a predictable way to recover after reinstalling Windows, replacing a computer, or losing a user profile. Set a cache lifetime or other refresh policy, and define what occurs when the app cannot refresh, a device changes, or an entitlement is revoked.
Windows Data Protection API (DPAPI) can protect locally stored data, but protection is tied to a security context. If that context is unavailable, the protected data may no longer be recoverable. DPAPI therefore does not replace an account-based restore path or a documented customer-support process. See Microsoft’s ProtectedData API documentation.
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- Tell customers how long they can use the app offline, if you impose a limit.
- Provide a way to restore entitlement after reinstall or profile loss.
- Explain how device transfers work and whether a previous activation must be released.
- Define how refunds, chargebacks, and revoked entitlements affect access.
- Design support procedures for a lost key or inaccessible account.
Sign and update the application safely
Store-distributed MSIX packages are re-signed by Microsoft as part of the Store route. With direct distribution, you are responsible for signing, hosting, and updates. Keep signing credentials out of source control and protect them with a suitable secret store or hardware-backed mechanism. Microsoft’s publishing guidance describes the distribution responsibilities; its cryptographic services documentation covers .NET cryptographic building blocks, not a complete release-security process.
Plan how customers will obtain updates and how you will replace or renew signing credentials before the first release. Signing is a package-integrity and publisher-trust measure; it is not a substitute for validating the customer’s entitlement.
Quick Recap
A practical end-to-end checklist
- Choose Store distribution or direct sales based on the operational control and workload you can support.
- Publish clear rules for editions, seats, duration, upgrades, device transfers, offline use, refunds, and recovery.
- For direct sales, verify payment server-side before creating an entitlement.
- Keep authoritative issuance on the server; put only the information and public verification material the client needs in the app.
- Use the Store license API for Store entitlements, or implement your own validation for a custom system. Do not confuse component licensing with product-wide licensing.
- Test offline use, reinstall and profile-loss recovery, device transfer, refund or revocation behavior, and customer support procedures.
- Choose a signing and update process appropriate to your distribution route, and protect signing credentials.
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