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Unlock Seamless Operations: Epicor P21 & Walmart Marketplace Integration

Automate Orders, Sync Inventory, and Accelerate Growth with a Unified Platform.

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The Challenge

The Disconnect: Why Manual Integration Slows Your Business

Managing sales on Walmart Marketplace while relying on a disconnected Epicor P21 ERP creates significant operational hurdles. Manual data entry is time-consuming, error-prone, and scales poorly, leading to lost sales, dissatisfied customers, and inaccurate financial reporting.

  • Manual order entry from Walmart into P21 consumes hours daily.
  • Out-of-sync inventory leads to frustrating oversells and customer cancellations.
  • Delayed product updates and pricing discrepancies impact competitiveness.
  • Lack of real-time visibility into sales performance and financial data.
  • Complex returns and refunds reconciliation across systems.
Integration Diagram
Solution Illustration
The Solution

The Unified Solution: Epicor P21 & Walmart Marketplace Integration with iPaaS

Our AI-enhanced iPaaS platform provides a robust, low-code solution to seamlessly connect Epicor P21 with Walmart Marketplace. It automates critical workflows, ensures real-time data synchronization, and provides the agility to scale your eCommerce operations without increasing manual overhead.

  • Pre-built, configurable connectors for Epicor P21 and Walmart Marketplace.
  • Visual, drag-and-drop workflow designer for rapid automation.
  • Real-time, event-driven data synchronization.
  • Advanced data mapping and transformation capabilities.
  • Centralized error handling, monitoring, and alerting.
Implementation Timeline

Go live with Epicor P21 + Walmart Marketplace in as little as 2–4 weeks.

A proven, repeatable implementation approach that minimizes risk while getting your team to value quickly.

1

Access Enabled

Secure connections established to both Epicor P21 and Walmart Marketplace, with credentials and environments confirmed.

2

Configuration & Mapping

Field mappings, business rules, and workflows configured using visual tools and pre-built templates.

3

Go Live

Launch production-ready integration with monitoring, alerting, and support in place—typically within 2–4 weeks.

Time to Value

2–4 weeks

Typical implementation window from access granted to production go-live for most Epicor P21 + Walmart Marketplace deployments.

Project Phases

Discovery
Configure & Map
Validate
Launch

Engagement Model

Guided by Clarity experts with your team involved at key milestones.

Comprehensive Solution Details

  • Pre-built, configurable connectors for Epicor P21 and Walmart Marketplace.
  • Visual, drag-and-drop workflow designer for rapid automation.
  • Real-time, event-driven data synchronization.
  • Advanced data mapping and transformation capabilities.
  • Centralized error handling, monitoring, and alerting.
  • AI-assisted mapping, validation, and anomaly detection.
  • Scalable architecture to handle high transaction volumes.

Technical Integration Details: Epicor P21 & Walmart Marketplace

Our iPaaS acts as the intelligent middleware, orchestrating seamless data exchange between Epicor P21 and Walmart Marketplace. It leverages modern API-first, event-driven architecture, combined with robust data transformation and error handling, to ensure reliable and efficient operations.

Data Flow Steps

Authentication: Securely connect to Epicor P21 via OAuth 2.0/API keys and Walmart Marketplace via OAuth 2.0 (Client ID/Secret, Access Token) with automated token refresh.

Event Detection: Utilize Walmart webhooks for new orders/returns or intelligent polling for changes in P21 (inventory, product updates).

Data Retrieval: Fetch relevant entities from the source system via API calls.

Data Mapping & Transformation: Harmonize disparate data schemas using a visual mapping canvas, applying rules, lookups, and AI-assisted transformations.

Data Validation: Ensure data integrity and compliance with target system requirements before submission.

Data Submission: Post or update records in the target system via optimized API calls (individual or bulk feeds).

Error Handling & Monitoring: Log all transactions, implement retries for transient errors, and alert on critical failures for proactive resolution.

Status Updates: Reflect changes (e.g., shipment tracking) back to the originating system.

Data Touchpoints

Walmart Orders <-> Epicor P21 Sales Orders
Walmart Order Items <-> Epicor P21 Sales Order Lines
Walmart Inventory <-> Epicor P21 Inventory Items (AvailableQty)
Walmart Products (Items) <-> Epicor P21 Product (Marketing/Catalog) & Inventory Item
Walmart Prices <-> Epicor P21 Price List
Walmart Shipments <-> Epicor P21 Shipments
Walmart Returns & Refunds <-> Epicor P21 General Ledger Entries / Invoices (AR)

"Walmart Marketplace (New Order/Return) -> Webhook/API Poll -> iPaaS (Retrieve, Map, Transform, Validate) -> Epicor P21 (Create Sales Order/Update Inventory/GL Entry) -> Epicor P21 (Shipment/Inventory Update) -> iPaaS (Retrieve, Map) -> Walmart Marketplace (Update Shipment/Inventory/Refund Status)."

Pricing

Simple, transparent pricing for Epicor P21 + Walmart Marketplace.

Start with a single integration pair and scale as your business grows—without surprise fees or transaction penalties.

Connect™ Plan

Clarity Connect

$595 /mo

Billed annually • Includes one production integration pair

  • Unlimited transactions and API calls within fair-use limits.
  • Visual workflow designer and reusable mapping templates.
  • Monitoring, alerting, and access to Clarity’s support team.
View full pricing & options
Innovative & Robust

How Middleware Integration Works

Benefits of Integrating Epicor P21

Integrating Epicor P21 fosters greater efficiency and data accuracy. Automate your critical business processes to deliver consistently outstanding results.

Hover over the steps on the right to see detailed integration points.
Data Mapping

Key Data Entities & Intelligent Mapping

Seamless data flow relies on precise mapping between Epicor P21's structured entities and Walmart Marketplace's API objects. Our iPaaS facilitates this with a visual mapping canvas, robust transformation logic, and AI assistance.

Sales Order (Epicor P21) / Order (Walmart Marketplace)

Represents a customer's purchase. Crucial for fulfillment and financial processing.

Epicor P21 Fields

OrderNum OrderDate CustomerID ShipToID OrderTotal OrderLines[] (PartNum, Qty, UnitPrice) RequestDate ShipViaCode

Walmart Marketplace Fields

purchaseOrderId customerOrderId orderDate orderStatus shippingInfo (name, address) orderLines (lineNumber, sku, quantity, unitPrice)

Mapping Notes

`purchaseOrderId` from Walmart maps to a custom field or reference in P21's `Sales Order` for traceability. `shippingInfo` maps to `ShipToID` and associated address fields in P21. `orderLines[sku]` must map to P21 `PartNum`.

Next Steps

See Epicor P21 + Walmart Marketplace integration in action.

Explore a guided demo, start a sandbox integration, or speak directly with our solution architects about your specific use cases.

Start Free Trial Request Live Demo
Real-World Applications

Integration Use Cases

Explore how the integration behaves in real business scenarios, with clearly defined steps, outcomes, and execution patterns.

Walmart Order-to-Epicor P21 Sales Order Automation

Automate the entire lifecycle of a Walmart Marketplace order, from its creation to its fulfillment and financial posting in Epicor P21. This ensures real-time data synchronization and reduces manual touchpoints.

Integration Steps:

  1. 0 Walmart Customer places Order (Walmart Order)
  2. 1 Walmart Marketplace sends Order event (Webhook or API Poll)
  3. 2 iPaaS retrieves Order details (purchaseOrderId, customerOrderId, shippingInfo, orderLines)
  4. 3 iPaaS maps Walmart Order to Epicor P21 Sales Order (OrderNum, CustomerID, OrderLines[PartNum, Qty])
  5. 4 iPaaS creates Sales Order in Epicor P21 (POST /api/v1/salesorders)
  6. 5 Epicor P21 allocates Inventory and initiates fulfillment
  7. 6 Fulfillment system provides Shipment details (trackingNumber, shippingCarrier)
  8. 7 iPaaS updates Walmart Marketplace with Shipment information (POST /v3/orders/{purchaseOrderId}/shipping)
  9. 8 Epicor P21 generates Invoice (InvoiceNum, InvoiceDate, CustomerID, InvoiceTotal)

Business Outcome

Seamless, error-free order processing, leading to faster delivery times and improved cash flow. Reduced customer support inquiries related to order status.

Frequency

Real-time (event-driven for new orders), Near real-time for updates

Business Value

Key Integration Benefits

Discover the strategic advantages and business value of seamless integration between your systems.

Accelerated Order Fulfillment
Automate order processing from Walmart Marketplace directly into Epicor P21, reducing manual entry and speeding up shipment initiation.
Eliminate Overselling & Stockouts
Achieve real-time, bi-directional inventory synchronization between Epicor P21 and Walmart, ensuring accurate stock levels.
Improve Data Accuracy & Consistency
Minimize manual errors and ensure consistent product, customer, and financial data across both systems with automated mapping and validation.
Boost Operational Efficiency
Free up valuable staff time from mundane data entry, allowing them to focus on strategic tasks and customer engagement.
Faster Time-to-Market for Products
Automate product listing and pricing updates from P21 to Walmart Marketplace, getting new offerings to market quicker.
Enhanced Customer Satisfaction
Provide accurate product availability, faster order processing, and timely shipping updates, leading to a superior customer experience.
✨

Accelerated Order Fulfillment

70% Faster Order Processing

📋 What You Get

Automate order processing from Walmart Marketplace directly into Epicor P21, reducing manual entry and speeding up shipment initiation.

💼 Business Impact

This benefit directly contributes to 70% improvement in Faster Order Processing, enabling your team to focus on high-value strategic initiatives.

Technical Documentation

API Endpoints & Data Logic

Technical details for developers and architects.

Method Endpoint Purpose
GET, POST, PUT /api/v1/salesorders Create new Sales Orders from Walmart, update status, retrieve details.
GET, PUT /api/v1/inventory Query real-time stock levels, update quantities.
GET, POST, PUT /api/v1/products Manage product master data for PIM/eCommerce sync.
GET, POST /api/v1/shipments Record shipment details, update fulfillment status.
GET, POST /api/v1/invoices Create AR invoices from sales, retrieve details for reconciliation.
GET, POST, PUT /api/v1/customers Synchronize customer records with CRM/eCommerce.

⚡ Transformation Logic

  • Data Type Conversion: e.g., String to Decimal for prices, Date format conversion.
  • Value Mapping: e.g., P21 `CarrierID` to Walmart `shippingCarrier` codes (UPS -> 'UPS').
  • Conditional Logic: e.g., If P21 `AvailableQty` < 0, send 0 to Walmart to prevent negative stock.
  • Concatenation/Splitting: e.g., Combine P21 address fields into a single string for Walmart, or split Walmart customer name into first/last.
  • Default Values: e.g., Assign a default `TermsCode` in P21 for new Walmart customers.
  • Calculated Fields: e.g., Calculate 'available-to-sell' inventory from P21's `OnHandQty` and `AllocatedQty`.

🛡️ Error Handling

  • Walmart API rate limits exceeded: iPaaS throttles and retries.
  • Invalid data from Walmart (e.g., malformed address): iPaaS logs, alerts, and routes to DLQ.
  • Epicor P21 API unavailable: iPaaS retries, queues, and alerts.
  • SKU mismatch between systems: iPaaS flags, logs, and requires manual mapping correction.
  • Duplicate Order detected: iPaaS prevents duplicate creation using idempotency keys.
Support & Information

Frequently Asked Questions

Common questions about integration implementation, security, and best practices.

General Integration FAQs

▸ What is the best way to integrate Epicor P21 with Walmart Marketplace?
The most effective approach is to leverage a modern iPaaS (Integration Platform as a Service). It provides pre-built connectors, robust visual mapping tools, and orchestration capabilities to handle real-time synchronization of orders, inventory, product data, and customer information between Epicor P21 and Walmart Marketplace, often using API-first and event-driven methods.

Inventory Management FAQs

▸ Can I automate inventory synchronization between Epicor P21 and Walmart Marketplace in real-time?
Yes, absolutely. An iPaaS facilitates real-time, bi-directional inventory synchronization. Changes in Epicor P21's `AvailableQty` for an `Inventory Item` can instantly update Walmart Marketplace's `quantity` via the `/v3/items/{sku}/inventory` endpoint or bulk feeds, preventing overselling and ensuring accurate stock visibility.

AI & iPaaS FAQs

▸ How does AI enhance Epicor P21 and Walmart Marketplace integrations?
AI significantly augments integrations by providing intelligent capabilities such as automated anomaly detection in Walmart orders (e.g., potential fraud), AI-assisted data mapping suggestions for complex `Product (Marketing/Catalog)` attributes to Walmart `Item (Product)` fields, predictive exception handling, and intelligent routing of workflows. This reduces manual intervention, improves data quality, and provides proactive operational insights.

Challenges & Solutions FAQs

▸ What are the common challenges when integrating Epicor P21 with Walmart Marketplace and how are they solved?
Common challenges include dealing with disparate data models, ensuring real-time data consistency, managing complex data transformations (e.g., P21 `PartNum` to Walmart `sku`), handling API rate limits, and implementing robust error handling. A specialized iPaaS addresses these by centralizing orchestration, providing visual mapping, intelligent throttling, and comprehensive error management with retries and alerts.

Security & Compliance FAQs

▸ How do I ensure data security during Epicor P21 and Walmart Marketplace integrations?
Prioritize using secure authentication methods like OAuth 2.0 for both systems, enforce data encryption in transit (TLS 1.2+) and at rest within the iPaaS, implement granular role-based access control (RBAC) for API users, and utilize secure credential management. The iPaaS should also comply with industry security standards and offer data masking capabilities for sensitive information, adhering to regulations like GDPR and CCPA.

Low-Code/No-Code FAQs

▸ Can I automate complex workflows involving Epicor P21 and Walmart Marketplace without writing custom code?
Absolutely. Modern iPaaS platforms offer low-code/no-code tools that allow business analysts and power users to visually design, build, and deploy complex workflows involving Epicor P21 and Walmart Marketplace. This significantly reduces development time and IT dependency for common automations like order processing, inventory updates, and product listing management.

Performance FAQs

▸ How does an iPaaS handle Walmart Marketplace API rate limits?
A robust iPaaS includes built-in features for managing API rate limits. This typically involves intelligent queuing of requests, dynamic throttling (slowing down calls when 429 errors are received), and configurable retry mechanisms with exponential backoff. It ensures that your integration requests are sent to Walmart's APIs at an optimal pace, preventing service interruptions and ensuring continuous data flow.

Governance FAQs

▸ What kind of governance is needed for Epicor P21 to Walmart Marketplace integrations?
Effective governance includes establishing a clear integration strategy, defining data ownership, implementing a Dev-QA-Prod environment promotion process, version control for integration flows, comprehensive monitoring dashboards, and regular auditing of integration performance and security. This ensures reliability, scalability, and compliance across your integrated operations.
Pricing

Simple, transparent pricing for Epicor P21 + Walmart Marketplace.

Start with a single integration pair and scale as your business grows—without surprise fees or transaction penalties.

Connect™ Plan

Clarity Connect

$599 /mo

Billed annually • Includes one production integration pair

  • Unlimited transactions and API calls within fair-use limits.
  • Visual workflow designer and reusable mapping templates.
  • Monitoring, alerting, and access to Clarity’s support team.
View full pricing & options
Next Steps

See Epicor P21 + Walmart Marketplace integration in action.

Explore a guided demo, start a sandbox integration, or speak directly with our solution architects about your specific use cases.

Start Free Trial Request Live Demo