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Walmart Marketplace Integration Guide
Connect Walmart Marketplace with enterprise systems through REST APIs, asynchronous feeds, scheduled synchronization, and selected account-dependent notifications.
Walmart Marketplace integration options at a glance
Walmart Marketplace uses REST APIs as its primary seller integration model for Items, Orders, Inventory, Prices, Returns, and related operations. Supported bulk activities use asynchronous Feeds: an integration submits a feed, stores its identifier, polls processing status, and retrieves results or errors. Notification or callback support may be available for selected programs and events, but it should be confirmed for the account; scheduled polling is the safer general pattern. Walmart uses client credentials to obtain access tokens and requires Walmart-specific request headers. Martini can secure those credentials, orchestrate API workflows, transform JSON, submit feeds, expose normalized APIs, and route validation or processing failures for review.
| Integration point | Supported by Walmart Marketplace? | Common use cases | How Martini supports it |
|---|---|---|---|
| REST APIs | Yes | Retrieve and update Orders, manage Items, synchronize Inventory and Prices, process Returns, and perform fulfillment-related operations. | Martini can consume Walmart Marketplace REST endpoints from workflows, map request and response payloads, and expose normalized REST APIs for internal consumers. |
| Bulk / asynchronous feeds | Yes | Submit supported bulk item, inventory, price, or other marketplace operations for asynchronous processing. | Martini can transform source data, submit a Feed, persist its identifier, poll status, and route record-level results or errors. |
| Webhooks / outbound callbacks | Limited | Selected Walmart programs or event types may provide notification or callback capabilities; coverage must be confirmed for the seller account and event. | Martini can receive a confirmed callback through an API endpoint or webhook-triggered workflow; otherwise it can use scheduled polling. |
| File / attachment APIs | Limited | Structured feed payloads may support bulk submission for particular operations, but a general-purpose attachment or file-storage API was not confirmed. | Martini can handle supported structured payloads and file transformations where required by a Feed endpoint, without assuming general attachment support. |
| Authentication | Yes | Applications use client credentials to obtain access tokens and send Walmart-specific access-token, application, service, quality-of-service, and correlation headers. | Martini can store credentials in secrets or protected environment configuration, obtain tokens in reusable workflows, and apply required headers to API calls. |
| GraphQL APIs | Not confirmed | No official GraphQL API was confirmed for the core Walmart Marketplace seller APIs. | Martini can consume GraphQL APIs generally, but Walmart Marketplace integrations should use the confirmed REST model unless Walmart documentation confirms otherwise. |
| SOAP APIs | Not confirmed | No official SOAP API was confirmed for Walmart Marketplace seller integrations. | Martini supports SOAP generally, but this integration should not assume a Walmart SOAP endpoint. |
| Database access | Not confirmed | Direct database access is not a documented Walmart Marketplace integration mechanism; operational information should come through APIs, reports, or exports where available. | Martini can connect to enterprise databases, but it should use Walmart APIs or supported exports rather than attempting direct Marketplace database access. |
How Walmart Marketplace exposes data and business events
Walmart Marketplace REST APIs
REST is Walmart Marketplace's primary documented seller integration mechanism. It covers catalog Items, Orders, Inventory, Prices, Returns, fulfillment actions, and related operations. Access and permissions vary by API, seller account, program, and region.
Martini implementation pattern
Martini implementation pattern: create reusable authenticated API workflows, retrieve or submit Walmart JSON payloads, map them to canonical and target-system models, apply business rules, and persist synchronization state. Separate workflows can handle order retrieval, acknowledgments, shipment updates, inventory, pricing, catalog, and returns.
Implementation sequence
Walmart Marketplace Feeds
Walmart Marketplace supports asynchronous Feed processing for selected bulk operations such as item, inventory, price, or other supported updates. Submission success does not guarantee item-level processing success.
Martini implementation pattern
Martini implementation pattern: read changes from an ERP, PIM, warehouse, or commerce platform; transform them into the applicable Walmart Feed structure; submit the Feed; store its identifier; poll status; and route rejected records or malformed payloads to an error or review workflow.
Implementation sequence
Walmart Marketplace callbacks
Notification or callback capabilities may be available for selected Walmart programs or event types, but webhook coverage should be confirmed for the seller account and required event. The general Marketplace model remains request-driven.
Martini implementation pattern
Martini implementation pattern: expose a controlled Martini API or webhook-triggered workflow only when Walmart confirms the applicable callback. The workflow authenticates or validates the incoming request as appropriate, retrieves the current Walmart resource when necessary, and applies idempotent downstream processing. Scheduled polling remains the fallback.
Implementation sequence
Scheduled Walmart synchronization
Scheduled retrieval is the safer general pattern for Orders, Feed statuses, Returns, and other resources when callback coverage is unavailable or incomplete. Collection endpoints may require pagination and overlapping polling windows.
Martini implementation pattern
Martini implementation pattern: use scheduler-triggered workflows with persisted cursors, timestamps, identifiers, or checkpoints. Retrieve pages with bounded concurrency, allow for late-arriving changes, map data to targets, and store the checkpoint only after successful processing.
Implementation sequence
Common Walmart Marketplace integration patterns
Pattern 1: Synchronize Walmart orders with an ERP
When to use this pattern
Use this pattern when Walmart Orders must create or update ERP sales orders and downstream fulfillment processes. It supports scheduled retrieval, order acknowledgment, shipment updates, cancellations, refunds, and duplicate protection.
Integration direction
Example Mapping
| Walmart Marketplace Field | Canonical Field | Target Field |
|---|---|---|
| orderId | externalOrderId | externalId |
| orderLines[].itemId | productExternalId | item |
| orderLines[].quantity | orderedQuantity | quantity |
| shippingInfo.postalAddress | shipToAddress | shippingAddress |
Martini implementation pattern
A scheduler-triggered workflow retrieves paginated Orders, validates required identifiers, and checks whether the Walmart order already exists in the ERP. It maps new orders, acknowledges accepted transactions, and separately processes shipment, cancellation, and refund operations. Transport failures are retried with backoff, while validation failures are routed for review.
Martini capabilities used
- workflows
- scheduled triggers
- API consumption
- data mapping
- business rules
- idempotency
- error handling
Pattern 2: Submit inventory and price feeds
When to use this pattern
Use this pattern for high-volume Inventory or Prices updates sourced from an ERP, warehouse, or commerce platform. Feed processing is appropriate when individual API calls would be inefficient or the Walmart operation is defined as asynchronous.
Integration direction
Example Mapping
| Walmart Marketplace Field | Canonical Field | Target Field |
|---|---|---|
| sku | itemIdentifier | sku |
| availableToSell | availableQuantity | inventory |
| sellingPrice | marketplacePrice | price |
Martini implementation pattern
Martini reads approved source changes, validates item identifiers and values, transforms them into the applicable Walmart Feed structure, and submits the Feed through the REST API. The workflow stores the Feed ID, polls status, processes partial results, and sends rejected lines to a correction workflow rather than resubmitting the entire batch blindly.
Martini capabilities used
- workflows
- API consumption
- JSON transformation
- data mapping
- validation
- scheduling
- retry handling
Pattern 3: Publish catalog Items from a PIM
When to use this pattern
Use this pattern when a product information system is the authoritative source for identifiers, attributes, descriptions, images, and compliance data that must be published to Walmart Marketplace.
Integration direction
Example Mapping
| Walmart Marketplace Field | Canonical Field | Target Field |
|---|---|---|
| productIdentifier | productId | productIdentifier |
| description | longDescription | productDescription |
| attributes | itemAttributes | attributes |
| lifecycleStatus | publicationStatus | status |
Martini implementation pattern
A Martini workflow retrieves approved catalog changes, validates required attributes and enumerations, applies Walmart-specific business rules, and submits supported item operations or a catalog Feed. It records submission results and isolates item-level errors so valid products can continue while incomplete products are remediated.
Martini capabilities used
- workflows
- API consumption
- data mapping
- validation
- business rules
- asynchronous orchestration
- error routing
Pattern 4: Synchronize returns with customer service
When to use this pattern
Use this pattern when customer-service or ERP teams need Walmart Returns, order context, refund status, and resolution information in a shared operational view.
Integration direction
Example Mapping
| Walmart Marketplace Field | Canonical Field | Target Field |
|---|---|---|
| returnId | externalReturnId | externalReturnId |
| returnLines[].orderLineId | externalOrderLineId | orderLineReference |
| status | returnStatus | status |
| refundAmount | refundAmount | refundAmount |
Martini implementation pattern
Martini periodically retrieves Returns, enriches them with stored order context where required, maps statuses into the customer-service model, and applies rules for duplicate or out-of-sequence updates. Supported downstream decisions can be translated into Walmart API operations, with audit records for every status or refund action.
Martini capabilities used
- scheduled workflows
- API consumption
- data enrichment
- mapping and transformation
- business rules
- audit logging
- error handling
Applications commonly integrated with Walmart Marketplace
Walmart Marketplace can be integrated with adjacent commerce, ERP, customer-service, and fulfillment applications to coordinate catalog, inventory, order, shipping, and returns processes. The exact source of truth and synchronization direction should be defined for each implementation.
| Application | Scenario | Direction | Martini Pattern |
|---|---|---|---|
| NetSuite | Synchronize Walmart orders, inventory, prices, fulfillment, returns, and financial-reconciliation data with ERP processes. | Walmart Marketplace → Martini → NetSuite | Use scheduled REST workflows to retrieve Orders and Returns, map them to NetSuite structures, and send inventory, price, shipment, cancellation, or refund updates to Walmart where supported. |
| SAP S/4HANA | Connect marketplace demand and fulfillment activity with enterprise order management, inventory, and finance processes. | Walmart Marketplace → Martini → SAP S/4HANA | Normalize Walmart Orders, Inventory, Prices, and Returns into canonical models, apply enterprise validation, and route accepted transactions into SAP workflows while tracking Walmart identifiers. |
| Salesforce | Give customer-service and commerce teams access to Walmart order, return, shipment, and customer-service context. | Walmart Marketplace → Martini → Salesforce | Poll Walmart resources on a schedule, map order and return status into Salesforce objects, and optionally translate approved downstream status changes back into Walmart API operations. |
| Shopify | Coordinate product, inventory, pricing, and order operations across a Shopify storefront and Walmart Marketplace. | Shopify → Martini → Walmart Marketplace | Use Shopify as a source for selected catalog or inventory data, transform it to Walmart payloads or Feeds, and route Walmart Orders into a shared order model to avoid duplicate fulfillment. |
| Microsoft Dynamics 365 | Synchronize Walmart orders, inventory, fulfillment, and returns with ERP and customer-service processes. | Walmart Marketplace → Martini → Microsoft Dynamics 365 | Orchestrate scheduled Walmart retrieval and outbound updates, validate identifiers and statuses, and maintain external keys for idempotent Dynamics 365 writes. |
| ShipStation | Send Walmart orders into fulfillment and return-shipment workflows and relay tracking information back to Walmart. | Walmart Marketplace → Martini → ShipStation → Martini、Walmart Marketplace | Retrieve released Orders, transform fulfillment requests for ShipStation, capture tracking results, and submit applicable shipment updates to Walmart with retry and duplicate protection. |
How to build a Walmart Marketplace integration in Martini
Objective
Establish Walmart Marketplace access using the account's approved client credentials, token flow, required headers, and environment-specific endpoints.
Instructions in Martini
- Store client ID, client secret, and endpoint configuration in Martini secrets or protected environment configuration.
- Implement a reusable token workflow for access-token acquisition and renewal.
- Add Walmart application, service, quality-of-service, and correlation headers as required by the API.
Objective
Select the trigger that matches the confirmed Walmart capability and required freshness, using callbacks only where the account and event support them.
Instructions in Martini
- Use a scheduler for Orders, Returns, Feed status, or other polling workflows.
- Use a Martini API or webhook-triggered workflow only for a confirmed Walmart callback.
- Define the polling window, checkpoint, and reconciliation frequency.
Objective
Call Walmart REST endpoints or submit supported Feeds while handling pagination, asynchronous processing, and account-specific permissions.
Instructions in Martini
- Retrieve collection pages using the endpoint's documented pagination model.
- For bulk work, submit the Feed and persist its identifier.
- Classify authentication, throttling, validation, and transient server responses separately.
Objective
Translate Walmart JSON and Feed structures into canonical models and target application schemas without coupling every downstream system to Walmart-specific fields.
Instructions in Martini
- Map Items, Orders, Inventory, Prices, Feeds, and Returns to canonical structures.
- Normalize statuses, identifiers, quantities, prices, addresses, and timestamps.
- Validate required fields and operation-specific enumerations before writing or submitting data.
Objective
Apply source-of-truth, fulfillment, pricing, inventory, return, and duplicate-prevention rules before committing changes.
Instructions in Martini
- Use Walmart order, line, item, and Feed identifiers as external keys where appropriate.
- Prevent duplicate order creation and repeated sensitive updates after timeouts.
- Route invalid records and partial Feed failures to a review or remediation workflow.
Objective
Persist accepted data in ERP, PIM, commerce, customer-service, or fulfillment applications and send permitted status updates back to Walmart.
Instructions in Martini
- Write only after validation and idempotency checks succeed.
- Record Walmart identifiers and target-system identifiers together.
- Send acknowledgments, shipment, cancellation, refund, inventory, or price updates where the applicable Walmart API permits them.
Common Walmart Marketplace data objects used in integrations
| Object | Typical Use | Common target systems | Martini handling |
|---|---|---|---|
| Items | Represent Marketplace catalog listings, product identifiers, attributes, lifecycle status, and item setup data. | PIM, Shopify, BigCommerce, NetSuite, SAP S/4HANA | Martini validates and maps catalog data, submits item operations or Feeds, and captures item-level processing errors. |
| Orders | Represent customer orders, order lines, fulfillment information, acknowledgments, cancellations, shipments, and refunds. | NetSuite, SAP S/4HANA, Microsoft Dynamics 365, Salesforce, ShipStation | Martini retrieves Orders, applies idempotency using Walmart identifiers, maps them to target order models, and orchestrates status updates. |
| Inventory | Represent available-to-sell quantities and inventory updates for Walmart Marketplace items. | ERP, warehouse systems, Shopify, BigCommerce, order management platforms | Martini reads source quantities, applies business rules, transforms inventory payloads or Feeds, and tracks accepted or rejected results. |
| Prices | Represent item pricing and price changes submitted to or retrieved from Marketplace APIs. | ERP, commerce platforms, pricing systems, shared commerce hubs | Martini normalizes pricing data, validates item identifiers and values, submits updates, and records asynchronous Feed outcomes where applicable. |
| Feeds | Represent asynchronous submissions for supported bulk or batch operations and their processing results. | ERP, PIM, commerce platforms, operational data stores | Martini submits Feeds, persists Feed identifiers, polls processing status, and routes partial success or rejected records to remediation workflows. |
| Returns | Represent return requests, return lines, statuses, and related resolution or refund information. | ERP, Salesforce, Microsoft Dynamics 365, customer-service platforms | Martini retrieves Returns, joins them with order context, maps status and refund data, and sends supported downstream updates. |
Authentication and security considerations
Authentication model
Walmart Marketplace uses a client-credential-based access-token flow. Applications obtain a token from Walmart's token service and send it with the required Walmart application, service, quality-of-service, and correlation headers.
Secure implementation
- Store client credentials, tokens, and endpoint configuration in Martini secrets or protected environment configuration.
- Use separate credentials and settings for development, test, and production.
- Renew tokens before expiration and avoid logging tokens, client secrets, or sensitive order information.
- Confirm permissions, scopes, required headers, and API-version behavior for the seller account and marketplace region.
Operational considerations for Walmart Marketplace integrations
Reliability controls
- Confirm endpoint-specific rate limits and use bounded concurrency with exponential backoff for throttling and transient server errors.
- Implement pagination and persist cursors, timestamps, identifiers, or checkpoints rather than relying only on page numbers.
- Use Walmart order, line, item, and Feed identifiers for idempotency and duplicate prevention.
- Treat Feed submission and item-level Feed processing as separate outcomes; handle partial success and rejected records.
- Use overlapping polling windows to accommodate late-arriving updates and reconcile Orders and Inventory periodically.
Change management
Version Walmart-specific mappings, validate required fields and enumerations, and isolate Walmart schemas from canonical enterprise models. Test authentication, throttling, pagination, Feed processing, downstream outages, retries, and schema changes before production deployment.
Why use Martini instead of scripts or point-to-point integrations?
Centralized orchestration
Martini provides a maintainable workflow layer for coordinating Walmart Marketplace with ERP, PIM, commerce, customer-service, and fulfillment applications. It separates Walmart-specific API behavior from downstream models and business processes.
Reusable integration logic
- Build reusable authentication, pagination, Feed polling, validation, mapping, and error-handling workflows.
- Expose normalized APIs so internal applications do not need to implement Walmart-specific headers and payloads.
- Apply consistent idempotency, retries, correlation IDs, auditability, and reconciliation across order and catalog processes.
- Use scheduled, API-led, or callback-driven execution according to the Walmart capability confirmed for each account.
Frequently asked questions
Walmart Marketplace can be integrated primarily through REST APIs for Items, Orders, Inventory, Prices, Returns, and fulfillment operations. Supported bulk activities use asynchronous Feeds, while selected notification or callback capabilities may depend on the seller program and event. Scheduled polling is the safer general approach when callbacks are not confirmed.
Yes. Martini can consume Walmart Marketplace REST APIs, obtain and refresh access tokens, submit supported Feeds, poll asynchronous results, map Walmart JSON into enterprise schemas, and expose normalized APIs for internal applications. No native Martini connector is documented in the supplied materials.
No. A dedicated Walmart Marketplace connector is not required. Martini can integrate using Walmart's confirmed REST APIs, client-credential authentication, supported Feed operations, and any account-specific callbacks or notification endpoints that Walmart enables.
Lonti does not charge an additional per-connector or per-vendor fee to integrate Walmart Marketplace. The integration is subject to the provisioned capacity of the Martini environment. Separate costs may apply from Walmart, infrastructure providers, logistics services, or other third-party systems depending on subscription, usage, and deployment model.
REST APIs are the primary method for seller integrations and cover catalog, orders, inventory, pricing, returns, and related operations. Use asynchronous Feeds for supported bulk processes. GraphQL and SOAP were not confirmed for the core Marketplace seller APIs, and general database access is not a documented integration method.
Do not assume that Walmart Marketplace delivers every event through webhooks. Notification or callback coverage may be limited to selected programs or event types and should be confirmed for the account. Martini can receive a confirmed callback, while scheduled polling remains the safer general pattern.
A robust workflow persists Walmart order, line, item, and Feed identifiers, uses checkpoints for incremental retrieval, and treats Feed submission as separate from Feed success. Martini can poll asynchronous results, apply idempotent writes, retry transient failures with backoff, and route rejected or duplicate-sensitive operations for review.
Yes. Martini can expose a REST API that presents internal applications with stable order, inventory, catalog, price, or returns operations. Workflows can translate those requests into Walmart-specific REST calls, apply validation and business rules, and return normalized responses without requiring each consumer to understand Walmart formats.
Related Martini documentation
API Workflows
Data Processing
Security Operations
API Exposure
Connect Walmart Marketplace with your enterprise systems
Use Martini to orchestrate Walmart Marketplace APIs, asynchronous Feeds, scheduled synchronization, mappings, business rules, and operational error handling across your application landscape.