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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteNo single party or platform automatically owns all data in a headless ecommerce stack. The answer depends on what you mean by “owns”: privacy law assigns responsibilities such as controller and processor, while the technical design assigns authority over particular records to systems such as a CRM, commerce platform, ERP, or order management system (OMS). Those assignments can differ by data type, service, and lifecycle stage.
What “ownership” means in headless ecommerce
Headless architecture separates a customer-facing storefront from backend commerce services, but that separation does not decide who is legally responsible for personal-data processing or which system is authoritative for each record.
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Legal responsibility: controller and processor
Privacy laws commonly distinguish a controller or business, which determines the purposes and means of processing personal data, from a processor or service provider, which processes data for another party. The specific terms and applicable law matter: contractual labels are important, but they do not settle every party’s role for every activity or jurisdiction.
Technical authority: the system of record
In an integration, “owner” can also mean the system that is authoritative for a field or workflow. A CRM may master customer contact details; a commerce platform may capture a checkout order; and an ERP or OMS may control what happens to that order afterward. Other applications may hold synchronized copies without being authoritative.
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Keep these two meanings separate. A vendor’s role under a data processing agreement (DPA) does not tell you which application should write the master customer profile. Likewise, making a system the technical source of truth does not by itself determine its legal role.
How platform contracts describe the legal roles
Shopify
Shopify’s DPA generally describes the merchant as controller and Shopify as processor for covered customer personal data, subject to exceptions. The DPA page displays a last-updated date of July 7, 2026: Shopify Data Processing Addendum.
One important exception is Shopify’s Enhanced Services. For processing described in Appendix E, Shopify says it acts as a controller or business, including for services involving analytics, product customization, advertising, and other uses of customer interactions and transactions across the merchant’s store, other merchants, and Shopify. Shopify says Shopify Network Intelligence can be disabled, though some apps or features may then be unavailable. Check the current DPA and the services enabled on the account to understand what applies.
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The DPA also excludes personal data Shopify receives through a customer’s direct relationship with Shopify via services such as Shop and Shop Pay. That is why “the merchant controls all customer data” is too broad: the answer can vary with the service and the relationship through which data is collected.
Shopify’s merchant terms describe the merchant as seller and merchant of record for sales, with responsibility for the store, its materials, and transaction handling. Its help guidance also says merchants retain independent privacy and data-protection obligations. Commercial responsibility for a sale is related to, but not the same as, determining privacy-law roles. Review the applicable terms and DPA: Shopify Terms of Service and Shopify guidance on GDPR.
commercetools
commercetools’ DPA says that, as between the parties, the customer is controller and commercetools processes personal data as a processor on the customer’s behalf or instructions. This describes that DPA relationship; it should not be generalized to every vendor, service, or processing purpose. See the commercetools Data Processing Agreement.
Assign technical ownership by data domain and lifecycle
There is no requirement that one application master every record. The integration guidance from commercetools illustrates how authority can be divided across systems and stages:
| Data or workflow | Common authoritative system in the cited guidance | Important qualification |
|---|---|---|
| Customer profile and contact details | CRM | commercetools may own the profile if no CRM masters it. A Customer record may still be needed in commercetools for permissions, cart and order assignment, and personalized promotions. |
| B2B account hierarchy, credit limits, and payment terms | ERP | These are common ERP responsibilities in the guidance; the implementation must confirm its own system of record. |
| Order capture and contents at checkout | Commerce platform | The commerce system captures the order at checkout. |
| Fulfillment status, shipments, cancellations, and returns after capture | OMS or ERP | Authority can move to the system managing the post-checkout order lifecycle. |
| Inventory | Often the system that owns the order lifecycle | Platform-side inventory tracking is optional in the cited guidance; decide explicitly where quantity changes are authoritative. |
These are examples, not universal allocations. The commercetools data ownership guide explains the distinctions between customer, B2B, order, and inventory responsibilities. The exact setup should reflect your connected systems and workflows.
Build a system-of-record map before integrating
For every data domain, document the authority and the handoff instead of assuming that the storefront or commerce platform owns everything. At a minimum, decide separately how your architecture handles:
- Customer profiles and contact details
- Consent and preference records
- B2B account structures and payment terms
- Product catalog
- Cart
- Checkout and captured order
- Post-checkout fulfillment, returns, and cancellations
- Inventory
- Analytics and event data
For each domain, record these implementation details:
- Authoritative system: Name the application whose value wins when records conflict.
- Writers and readers: Identify which systems may create or update the record and which only consume a copy.
- Synchronization: Specify the event or API that sends changes, including the expected direction and timing.
- Conflict handling: Define how to resolve duplicate, delayed, or out-of-order updates.
- Retention and deletion: Document how long records remain and how deletion or correction propagates to connected systems.
- Privacy requests: Establish how access, correction, deletion, and export requests are handled across the stack.
- Vendor exit: Decide how data is returned, retained, or deleted when a vendor relationship ends.
This map is an implementation practice, not a quoted platform requirement. Its purpose is to make legal obligations workable across systems that create, copy, and update related records.
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What to check when selecting a platform or designing integrations
Purpose and role allocation
For each processing activity, establish who determines its purpose and means and whether the vendor’s role changes for particular services. Read the DPA and service terms rather than relying on a general claim that a platform is “only a processor.”
Data use and service settings
Ask what data is used for analytics, advertising, personalization, or services operating across merchants. Check the relevant settings and determine what notices, disclosures, or consent obligations apply to your business.
Record authority and lifecycle
For every important domain, identify the system of record at each stage and distinguish it from systems that merely receive copies. A checkout order and its later fulfillment status, for example, may have different authoritative systems.
Rights requests and vendor termination
Work out how privacy notices, access and deletion requests, retention rules, and vendor termination affect data in the platform and connected applications. Shopify’s DPA assigns merchants notice and rights responsibilities for relevant processing, while describing separate roles for certain Enhanced Services.
Synchronization failures
Specify what happens when systems disagree, an update arrives late, or a connected application is unavailable. An integration design needs clear retry, conflict-resolution, and recovery behavior; a list of connected products alone does not establish those rules.
How to make the answer specific to your store
- Map data flows: List what personal and operational data is collected, where it goes, which services use it, and which systems retain it.
- Review the actual agreements: Check the current DPA, merchant terms, and terms for enabled services. Do not assume a platform’s general role applies to every feature.
- Check jurisdiction and context: Determine which privacy laws apply to your business and the people whose data you process. Legal duties depend on those facts as well as on contract terms.
- Assign technical authority: Name the system of record for each domain and lifecycle stage, then document synchronization and conflict rules.
- Test privacy operations: Confirm that a request to access, correct, export, or delete data can be handled across the relevant connected systems.
Shopify’s Help Center puts the merchant’s role plainly: “You’re generally the controller of your customers’ data.” That is Shopify’s description of its general relationship with merchants, not a universal legal conclusion for every service or store. Its privacy guidance also states that Shopify provides store technology while the sales contract is between the merchant and customer. Read those statements alongside the applicable contract and actual data flows: Shopify’s GDPR guidance and Shopify’s privacy and data-protection guidance.
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