ERP Integration for Wholesale That Handles Any Volume
Tiered prices for hundreds of customers, stock from multiple warehouses and orders with triple-digit line counts sync to the second between shop and inventory system. We build the interfaces that carry this volume — as a SAP, JTL or inventory-system connection at a fixed price.
< 2 s
sync latency per goods movement
500k+
prices synchronized (project experience)
99.8%
interface uptime (project experience)
50+
integration projects (project experience)
Fixed price · net plus VAT
- Fixed price after a free system analysis instead of an open estimate
- Multi-warehouse stock, tiered pricing logic and order flow in one middleware
- EDIFACT, OpenTrans and OCI punchout for your key accounts
- Interface monitoring well beyond go-live
SAP Business One as the base for wholesale volume. JTL-Wawi or inventory-system connection from 4,900 €, marketplace connection per channel from 2,480 €. Extensions such as EDI channels or additional data flows at 990 € net per project day (hourly 119 € per hour). All prices net plus VAT. The project day is a package price for a reserved working day and therefore deliberately not a multiple of the hourly rate — the rationale is on the pricing overview.
Wholesale means volume: assortments with 20,000 to 500,000 articles, customer-specific price lists with hundreds of thousands of entries, stock levels across multiple locations and orders that must be captured in minutes and transferred to the ERP in real time. The technical challenge of shop integration in wholesale lies not in the connection itself but in the performant processing of these data volumes. While a B2C shop works with a manageable product catalog and uniform pricing, wholesale integration must handle a hundred times higher data volumes with simultaneously stricter requirements for speed and accuracy.
Which connection applies in wholesale depends on the leading system: for SAP landscapes, SAP integration describes the route via Service Layer and OData, for Microsoft environments Dynamics 365 shop integration. Smaller inventory systems are connected through inventory system integration or JTL-Wawi shop integration. If you also sell via platforms, marketplace integration extends the channel mix, and with many parallel data streams a middleware decouples shop and ERP. Accounting is completed by DATEV integration; related scenarios are covered under manufacturing and specialised trade.
Shop and Inventory System in One Data Flow
The Three Pillars of Wholesale ERP Integration
Every wholesale integration rests on three pillars that are tightly interconnected: product data and pricing, inventory management and order flow. When one pillar weakens, the entire system collapses. A price displayed differently in the shop than agreed in the ERP leads to complaints. Stock marked as available in the shop when it has already been picked in the warehouse leads to cancellations. An order arriving late in the ERP disrupts route planning. That is why we build integrations that serve all three pillars simultaneously and with equal reliability.
Price Sync for Complex Condition Models
Multi-tier volume pricing, framework agreement terms, customer group discounts and promotional prices. All pricing levels are synchronized from the ERP and applied in the correct hierarchy in the shop. Redis caching ensures load times under two seconds, even with 500,000+ price variants.
Multi-Warehouse Inventory
Real-time stock across all warehouse locations with event-based synchronization. Every goods movement, whether receipt, picking or transfer, is reflected in the shop within seconds. Reservation logic prevents double-selling on parallel orders.
Order and Document Flow
Orders flow into the ERP as structured sales orders including all conditions, delivery notes and customer reference numbers. Order confirmations, delivery notes and invoices flow back and are available in the customer portal.
Pricing Logic in Wholesale: Why Standard Connectors Fail
Price determination in wholesale is a multi-dimensional problem that regularly overwhelms standard integrations. A single article can simultaneously be subject to a list price, a customer group price, an individually negotiated contract price and a time-limited promotion. Add tiered prices with up to ten levels that adjust automatically based on order quantity, volume discounts that accumulate across multiple articles in a product group, and rebates that only apply above a certain annual revenue, and price determination becomes a calculation that must be accurately mapped in the middleware.
Our pricing module implements a multi-level hierarchy with clear priority rules: individual contract price beats customer group price, customer group price beats tiered price, tiered price beats list price. Promotional prices can override any level when explicitly configured as priority. In the cart, the buyer transparently sees which condition applies and what savings are achieved versus the list price. This transparency builds trust and significantly reduces enquiries to the inside sales team.
Price hierarchy that resolves every condition correctly
From base condition to the valid cart price
The middleware checks each pricing level in a fixed order and returns the highest-priority valid price to the shop. Every buyer sees exactly their agreed condition without maintaining a separate price list per shop in the ERP.
- Four pricing levels with clear priority rules
- Tiered prices with up to ten quantity levels
- Transparent savings display in the cart
Real-Time Inventory: From Goods Receipt to Customer Screen
In wholesale, stock data determines revenue or cancellation. When an article shows as available in the shop, it must actually be in the warehouse. When it is being picked, the stock must be reduced immediately, not at the next batch run two hours later. And when a goods receipt replenishes stock, the article should be orderable again instantly, not after the next nightly import cycle.
We implement event-based inventory synchronization that reacts to changes in the warehouse management system, not to schedules. Every goods movement, whether receipt, picking, dispatch, return or transfer, triggers a sync event that updates shop stock within one to two seconds. For wholesalers with multiple warehouse locations, the system displays stock per warehouse and calculates estimated delivery time based on route planning. When an item is unavailable at the nearest warehouse but available at another location, the buyer is automatically informed and can choose a partial or alternative delivery.
Event-based inventory across multiple warehouses
Every goods movement reaches the shop in seconds
Instead of nightly batch runs, every posting in the warehouse management system triggers a sync event. Reservations block stock as soon as the cart is created, so parallel orders cannot sell the same article twice.
- Receipt, picking and return as live events
- Reservation logic against double-selling
- Stock per location with delivery-time forecast
Order Processing: From Cart to Inventory System
A wholesale order fundamentally differs from a B2C purchase. It contains dozens to hundreds of line items, customer-specific article numbers alongside internal ones, buyer reference numbers, preferred delivery dates with time window booking, delivery instructions per line item and potentially an approval chain with multiple authorization levels. All this information must arrive completely and correctly in the ERP so that downstream processes, picking, route planning, invoicing, can proceed without manual intervention.
Our order middleware transforms the shop order into your ERP system's order format and ensures correct field mapping. Customer-specific article numbers are mapped to your internal SKUs, quantity units converted, conditions validated and delivery preferences checked against route planning. The resulting ERP order is fully editable and structurally indistinguishable from a phone-captured order. The order confirmation with all confirmed delivery dates and prices flows automatically back to the customer portal.
EDI Integration for Key Accounts
Many key accounts in wholesale use their own procurement systems and expect electronic data interchange via standardized formats. EDIFACT messages for orders (ORDERS), order confirmations (ORDRSP), dispatch advice (DESADV) and invoices (INVOIC) are prerequisites for the business relationship in many industries. Alternatively, we offer OCI punchout for direct connection to customers' SAP-based procurement portals.
EDI communication is managed through our middleware layer and embedded in the existing ERP integration. Incoming EDI orders are converted to shop orders and go through the same validation and processing pipeline as online orders. Outgoing EDI messages are generated automatically once the ERP completes the corresponding business transaction. A log documents every EDI exchange with send status, timestamp and message content for traceability and error analysis.
What makes an integration wholesale-ready
Volume-proof
Article masters with hundreds of thousands of entries, carts with triple-digit line counts and large price lists are processed without noticeable delay.
Condition-accurate
Contract, customer group, tiered and promotional prices resolve by clear priority rules, so every buyer sees their agreed condition.
Real-time coupled
Event-based inventory and order synchronization keeps shop and inventory system in lockstep to the second, without nightly batch pauses.
EDI-capable
EDIFACT, OpenTrans and OCI punchout connect your key accounts' procurement systems through the same middleware.
Monitored
A monitoring dashboard shows sync status, latencies and error rates and flags stock discrepancies before they become a problem.
Supported long-term
Contract tests detect breaking changes early; quarterly reviews keep data quality and performance on track.
Performance Requirements and Architecture Decisions
Redis-Based Price Caching
Customer-specific prices are held in Redis and invalidated and reloaded with every ERP change. Even with 500,000+ price variants, cart price calculation stays under two seconds.
Elasticsearch for Large Assortments
Product search and faceted filtering across assortments with 200,000+ articles in millisecond response times. Optimized mappings for technical attributes, product groups and availability status.
Asynchronous Order Processing
Orders with 200+ line items are processed asynchronously so the order submit does not block. The buyer receives an immediate acknowledgment; the full order confirmation follows after ERP processing.
Monitoring and Alerting
Real-time dashboard for synchronization status, error rates and latency times. Configurable alerts for delays, failed syncs or stock discrepancies. Proactive problem detection instead of reactive troubleshooting.
Typical Integration Path for Wholesalers
Data Analysis and Interface Inventory
Analysis of your product master data, pricing structures, inventory management and order formats. Inventory of existing ERP interfaces and definition of synchronization requirements.
Data Cleanup and Mapping
Identification and cleanup of data quality issues: missing required fields, inconsistent units, duplicate article numbers. Creation of field mappings between ERP and shop.
Middleware Development and Load Testing
Implementation of synchronization logic with a focus on performance. Load testing with real data volumes: 200,000 articles, 500,000 prices, carts with 200+ line items.
Pilot Operation with Key Accounts
Phased introduction starting with selected pilot customers. Validation of prices, inventory and order flows under real conditions before the platform opens to all customers.
Full Operations and Continuous Optimization
Rollout across all customer groups, ongoing monitoring and quarterly optimization reviews. Adjustment of synchronization intervals, expansion with new data flows and performance tuning.
Long-Term Support for Wholesale Integration
An ERP-shop integration in wholesale is not a completed project but a permanent connection that must keep pace with updates from both systems. Our maintenance packages include proactive monitoring of all synchronization processes, timely adaptation to API changes and quarterly reviews of data quality and performance. Through automated contract tests, we detect breaking changes early and can react before production updates. This long-term perspective ensures your integration works reliably not only today but also in two years, keeping pace with your growing requirements.
Long-term support also includes adaptation to seasonal demands: during periods of high order volume, we scale synchronization capacity and monitor integration performance more intensively. This ensures your ERP-shop connection remains stable and reliable even during peak times.
Let us talk about your data volumes
Tell us your assortment size, pricing structure and warehouse landscape. We will outline an integration path that fits your volume and name the business-critical data flows for the first build step.
Frequently Asked Questions About ERP Integration in Wholesale
Industry-related articles: Customer-Specific Prices from ERP describes tiered and contract pricing logic, B2B Customer Access shows how assortments are controlled per customer group, and OCI Punchout explains connecting to the procurement portals of your customers.