To connect a restaurant loyalty app to a point-of-sale system, first choose the POS-specific integration contract: Square can connect an app to Square Loyalty, Toast sends transaction requests from its POS to a provider’s REST endpoint, and Oracle documents a real-time Simphony integration with CrowdTwist. These are different models, not interchangeable APIs. Your design must account for the entire purchase lifecycle, identity matching, reward rules, network failures, and how points change when orders are refunded.
Choose the integration model before designing the app
The POS determines how your app exchanges data and which system owns loyalty rules. Compare the documented options against the restaurant’s existing POS, desired control over program rules, and ability to support the required setup.
| Platform and model | How data moves | Key design considerations |
|---|---|---|
| Square Loyalty API | A third-party app integrates with Square Loyalty, alongside Square’s Customers, Orders, and Catalog APIs. Sellers configure the base program in Square Dashboard. | Whether the restaurant already uses Square Loyalty; customer-profile matching; dependence on Orders API flows; country availability; and refund treatment. Square documentation |
| Toast third-party loyalty | Toast POS sends HTTPS REST transaction requests to a loyalty provider’s endpoint. The provider returns account or reward results and owns loyalty business logic. | Endpoint and sandbox setup; supported discount types; guest-facing enrollment; offline behavior; and provider responsibilities for customer data and consent. Toast guide |
| Oracle Simphony with CrowdTwist | Oracle describes real-time API calls for member lookup or creation, reward lookup, payment with points, transaction-based points issuance, receipt details, and multiple members per check. | Simphony deployment and configuration, required capabilities, account identification, and vendor implementation arrangements. These listed capabilities are for the documented integration, not a guarantee for every version or configuration. Oracle documentation |
For Square, the Loyalty API works with Square’s existing loyalty program; it does not create or modify the seller’s base program settings. Toast instead defines a POS-to-provider transaction interface. Oracle’s CrowdTwist documentation describes its own Simphony integration. Confirm the platform’s current API version, onboarding requirements, regional availability, and configuration with its official documentation before committing to an architecture.
Map the complete order and loyalty lifecycle
A loyalty integration is more than a sign-up form or a points-award call. Model each event from identifying the guest through settling the check, and decide what happens if requests are retried, delayed, or reversed. Toast’s documented POS flow is a useful example of the distinct stages involved; other POS platforms may use different event sequences. Toast POS workflow
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- Identify the member. The POS or guest-facing surface searches for an account using supported identifiers.
- Inquire about rewards. The integration checks which rewards are available for the account and check.
- Confirm redemption as payment begins. The workflow must establish whether a selected reward is actually being used, rather than merely displayed as available.
- Accrue points after payment. Toast’s workflow places accrual after payment, so the integration needs to distinguish a completed purchase from an open or abandoned check.
For every transaction type, define a stable way to associate the request with its check or order, how duplicate or retried requests are detected, and how the system handles a timeout when the POS and provider may disagree about the outcome. Plan reversal behavior separately: a voided check, canceled redemption, or refund can affect the reward balance differently. The sources describe platform-specific behavior rather than one universal retry or reversal protocol, so verify the relevant POS contract.
Decide where loyalty rules and customer policies live
Make the responsibility boundary explicit in the integration design. Toast says the provider determines reward eligibility and accrual and owns loyalty business logic, account policies, validation, and guest-data practices. Toast supplies the technical connection that transmits information; it does not make the provider’s loyalty decisions. Toast business logic
Square’s model differs: sellers manage base loyalty program settings in Square Dashboard, and the Loyalty API cannot create or modify those settings. The API can support tasks such as enrolling buyers, looking up programs and accounts, tracking activity, and managing promotions. Square Loyalty API overview
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Before implementation, assign an owner for each decision: reward eligibility, points calculation, enrollment, account validation, contact-data handling, marketing consent, and compliance. In Toast’s model, these provider responsibilities are particularly explicit; do not assume the POS will make those decisions for your service. Privacy and consent requirements depend on where the restaurant operates and how the service uses customer information. Platform documentation is not a substitute for jurisdiction-specific legal review.
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Design account lookup to avoid duplicate profiles
Identity matching affects both customer experience and data quality. In Square, a loyalty account is associated with a Customer Directory profile. If an app creates an account based only on a phone number, a mismatch can result in a duplicate customer profile. Square advises searching with another identifier, such as email or reference ID, where available before creating the loyalty account. Square Loyalty API overview
Toast’s employee POS flow supports searches by phone, email, or name; barcode or card swipe may also be used. The employee POS does not create accounts. New-member sign-up is available through supported guest-facing display and kiosk modes, so enrollment must be designed for the surfaces the restaurant actually uses. Toast POS workflow
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- Choose which identifiers can be used for lookup and which are required to create an account.
- Specify how staff resolve ambiguous matches rather than silently creating another profile.
- Align the enrollment screen with the POS flow; do not assume a cashier-facing search function also supports sign-up.
Implement and test each platform’s requirements
Square
The seller configures and subscribes to Square Loyalty through Square Dashboard. The app can use Square’s APIs to enroll buyers, look up programs and accounts, track loyalty activity, and support promotions; base program settings remain managed in Dashboard. Square recommends Orders API-based accrual flows where applicable. Its documentation describes calculating and accruing points against orders and automatic point adjustments for refunds depending on the program and refund type. Verify the intended order and refund behavior for the seller’s actual configuration. Square API reference
Square Loyalty availability is country-specific. Check current country coverage and seller eligibility before choosing this model; do not assume an API reference means the program is available to every merchant.
Toast
Toast describes one HTTPS REST endpoint for the provider, with transaction types identified by an HTTP header. Its build guide calls for integration setup, submission of a test endpoint for sandbox setup, a decision about discount types, and integration testing. If the app supports item-level discounts, Toast says menu information must be saved through the Menus API so administrators can map discounts to menu items. Toast implementation guide
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Toast’s documented flow includes account lookup, reward inquiry, redemption, and post-payment accrual. Choose which discount types to support and ensure the POS configuration, menu data, and provider logic agree on how each eligible reward applies.
Oracle Simphony with CrowdTwist
Oracle’s documentation lists real-time member creation and lookup, reward lookup, payment with points, transaction information for points, receipt loyalty information, and multiple members per check. Confirm which capabilities are available in the restaurant’s Simphony deployment and what configuration or vendor arrangements are needed; the documented feature list should not be read as a promise for every installation. Oracle Simphony integration
Plan for outages, refunds, and real-world failure states
Toast states that its third-party loyalty integration does not work when a location is offline because of an internet outage or another network disruption. Decide what the POS and staff should do when the provider cannot be reached: whether to continue taking payment without loyalty, how to explain unavailable rewards, and whether any later reconciliation is supported by the chosen integration. Do not promise offline loyalty functionality unless the platform and provider explicitly support it. Toast integration overview
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Quick Recap
Use a platform-specific launch checklist
- Contract: Confirm the POS-specific API model, current documentation, merchant eligibility, and required onboarding.
- Lifecycle: Test lookup, reward inquiry, redemption, payment, accrual, retry, and reversal paths.
- Identity: Check matching behavior for changed phone numbers, shared contact details, ambiguous search results, and existing profiles.
- Rules and data: Assign responsibility for eligibility, points, account policies, guest information, and consent.
- Operations: Test unavailable endpoints and network disruption, and define what staff should tell guests.
- Configuration: Verify discount types, menu mappings, order data, receipt details, and supported enrollment surfaces for the selected POS.
- Geography and version: Confirm current regional availability and platform configuration rather than generalizing from a feature listed in documentation.
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