Shop Integration and ERP Connectivity for Your Online Shop
We connect online shops bidirectionally with SAP, DATEV, Microsoft Dynamics and inventory management — products, stock, prices and orders flow automatically in near real time. Fixed price per connection after a free initial assessment, from €4,900 net.
In short and in plain language
We link your online shop with other programs. Mainly these are your stock software and your accounting.
An interface links programs with each other. Then data moves back and forth on its own. This means products, prices, stock and orders.
So you type less by hand. This can save work and mistakes.
The first assessment is free. After that you get a fixed price.
On request we keep an eye on your links after the start. Write to us or give us a call.
Key figures
since 2013
integration experience
GoBD
requirements supported in document handover
Support
support agreement for operations and monitoring after go-live
Fixed price
quote after initial assessment
Fixed prices · net plus VAT
- Fixed price per connection instead of an open estimate
- SAP, DATEV, Microsoft Dynamics, JTL-Wawi and Lexware connected
- Bidirectional sync of products, prices, stock and orders
- Binding price after a free initial assessment
SAP Business One integration from €9,900, Microsoft Dynamics 365 from €6,900, DATEV connection from €1,490 and marketplace per channel from €2,480. Custom API and middleware development at €990 net per project day (hourly rate €119). All prices net plus VAT, ongoing third-party licenses shown separately. 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.
Prices as of September 2026.
Shop integration breaks down data silos, reduces manual processes and creates a consistent data foundation for your entire sales operation. As a specialized integration agency, we connect SAP Business One and S/4HANA, DATEV, Microsoft Dynamics 365 and industry-specific ERP systems with your online shop. The result: product master data, stock levels, customer-specific prices and order status are consistent across all systems in real time, without manual intervention.
Shop Integration Decision Matrix
One data flow that keeps every system in sync
Your shop is not an isolated system. Through a central integration layer, we connect it bidirectionally with ERP, accounting and inventory management, so product data, prices, stock and orders flow consistently in both directions. Architecture details are on our middleware page.
- Products, prices and stock from the ERP into the shop
- Orders and order status back into the ERP
- Fault-tolerant synchronization with automatic retries
Six core competencies for seamless system landscapes
Every integration project has unique requirements: different ERP systems, different data volumes, different synchronization intervals. In our project work, we have distilled this experience into six coordinated service areas, from a single DATEV connection to a complete middleware architecture.
ERP Integration
Bidirectional connectivity with SAP Business One, S/4HANA, Microsoft Dynamics 365 and industry-specific ERP systems. Products, customer prices, stock and orders flow automatically between ERP and shop.
Learn moreAPI Development
High-performance REST and GraphQL APIs for communication between shop, ERP, PIM and other systems. Token authentication, rate limiting, versioning and documentation are our standard.
Learn moreMiddleware and ESB
Robust middleware layers as a central hub between all systems. Message queues, event-driven architecture and dead-letter handling secure every record, even during peak loads.
Learn moreData Synchronization
Real-time and near-realtime sync of product data, stock, prices and order status. Conflict resolution for bidirectional scenarios, delta sync for large datasets, automatic retries.
DATEV Accounting Integration
Automated transfer of invoices, credit notes and payments to DATEV Unternehmen Online. Account assignment rules in the integration layer, Archiving that supports the GoBD requirements included.
Learn moreOperations and Monitoring
On request, after go-live we monitor your interfaces with proactive monitoring, automated alerts and escalation processes. Health checks, capacity planning and quarterly optimization reviews.
Why seamless system integration is business-critical
In many organizations, product data, customer master data, prices and inventory exist simultaneously in multiple systems: in the ERP for inventory management, in the PIM for product information, in the shop for sales and in accounting for invoicing. Without proper interfaces, inconsistencies arise that have direct business impact.
| Data area | Without integration | With seamless integration |
|---|---|---|
| Prices | Maintained manually, error-prone | Updated from the ERP in seconds |
| Stock levels | Outdated, overselling possible | Real-time availability in the shop |
| Orders | Retyped, media breaks | Created automatically as ERP orders |
| Invoices | Collected and re-entered | Transferred to DATEV in structured form |
| Scaling | Maintenance effort grows along | New channels without extra maintenance effort |
Typical data flows in an integration project
Every project has individual requirements, but the fundamental data flows recur. We implement these six synchronization areas in nearly every project, prioritized at launch or in later phases depending on your system landscape.
Product Master Data
Names, descriptions, attributes, categories, images and technical data sheets are synchronized from the ERP or PIM to the shop. Changes are available without manual intervention.
Prices and Conditions
List prices, customer-specific special prices, volume discounts and time-limited promotional prices are transferred from the ERP. Currency conversion and tax rates run in the integration layer.
Stock Levels
Available quantities, reservations and reorder dates are synchronized in real time. Multi-warehouse queries, minimum stock warnings and ATP calculations are implementable.
Orders and Transactions
Orders from the shop are automatically created as sales orders in the ERP. Order status, partial deliveries and cancellations flow back and inform the customer.
Customer Master Data
Company addresses, contacts, payment terms and credit limits are synchronized between CRM, ERP and shop. New customers are automatically created as debtor records.
Invoices and Documents
Invoices, credit notes and payment information are transferred to accounting in a structured format. Automatic account assignment saves your team considerable manual effort.
One middleware, many connected systems
Instead of wiring every system directly to every other, the middleware bundles all connections in a star topology. Every connector is replaceable: you migrate the ERP without touching the shop adapter, and you attach new channels simply as another consumer.
- Star architecture instead of point-to-point sprawl
- Connectors replaceable and versionable individually
- New sales channels without touching existing flows
Our project approach: From data flow diagram to live operations
Integration projects rarely fail because of technology, but because of insufficient requirements analysis. Which system is the master for which data? How are conflicts resolved? What happens during an outage? We clarify these questions before the first line of code is written.
System Analysis and Data Flow Mapping
In a joint workshop, we capture your system landscape, identify the data flows between all systems and document the data ownership for each entity type. The result is a detailed data flow diagram with interfaces, formats and synchronization directions.
Interface Specification and Prototyping
Based on the analysis, we define API specifications, data formats and transformation rules for each data flow. Critical interfaces are implemented as proof of concept and validated with real test data before overall development begins.
Iterative Development in Sprints
Implementation proceeds in two-week sprints, prioritized by business criticality. Product master data and price synchronization typically come first, followed by order write-back and stock reconciliation.
Integration and Load Testing
Before go-live, we test the data flows end-to-end on a test environment. Where the package includes a load test, we simulate peak scenarios: What happens with 10,000 simultaneous product updates? How does the queue behave during a 30-minute ERP outage?
Go-Live and Cutover
Go-live follows a detailed cutover plan: initial migration of master data, activation of real-time synchronization, validation of first live transactions and a defined rollback plan. A carefully planned cutover keeps operational disruption low.
Monitoring and Ongoing Operations
On request, after go-live we monitor the interfaces with automated health checks and alerting; ongoing monitoring is a separately bookable package. Failed transactions move to a dead-letter queue and are reprocessed after the root cause is resolved. Quarterly optimization reviews keep your integration current.
In a joint workshop, we capture your system landscape, identify the data flows between all systems and document the data ownership for each entity type. The result is a detailed data flow diagram with interfaces, formats and synchronization directions.
Based on the analysis, we define API specifications, data formats and transformation rules for each data flow. Critical interfaces are implemented as proof of concept and validated with real test data before overall development begins.
Implementation proceeds in two-week sprints, prioritized by business criticality. Product master data and price synchronization typically come first, followed by order write-back and stock reconciliation.
Before go-live, we test the data flows end-to-end on a test environment. Where the package includes a load test, we simulate peak scenarios: What happens with 10,000 simultaneous product updates? How does the queue behave during a 30-minute ERP outage?
Go-live follows a detailed cutover plan: initial migration of master data, activation of real-time synchronization, validation of first live transactions and a defined rollback plan. A carefully planned cutover keeps operational disruption low.
On request, after go-live we monitor the interfaces with automated health checks and alerting; ongoing monitoring is a separately bookable package. Failed transactions move to a dead-letter queue and are reprocessed after the root cause is resolved. Quarterly optimization reviews keep your integration current.
Integration is not a one-time data export, but a living data flow. Only when products, prices and orders move between shop and ERP without media breaks does a company truly work digitally.
Common challenges in integration projects
In our project practice, we repeatedly encounter similar challenges that we address with proven solution approaches.
Data Quality
Product data maintained over years with inconsistent formatting, missing mandatory fields or outdated categories cannot be fixed by a connector alone. Every project begins with a data quality analysis and a remediation plan.
Differing Data Models
A product in the ERP has different attributes than a product in the shop, and address tables follow a different schema in every system. This transformation, the data mapping, is documented in a mapping matrix and tested with real data.
Error Handling in Distributed Systems
What happens when the ERP is unreachable during an update? Our middleware uses circuit breakers, retry strategies with growing wait times and dead-letter queues for precisely these scenarios.
Technology stack for reliable integrations
The choice of technology determines reliability, performance and maintainability. We rely on proven technologies with active communities rather than proprietary platforms that lock you into vendor dependency.
REST and GraphQL
Standardized APIs for communication between all systems. REST for classic CRUD operations and GraphQL for flexible, demand-driven data queries with minimal network overhead.
Message Queues
RabbitMQ and Redis Streams for asynchronous processing of large data volumes. Persistent messages are designed so that no transactions are lost during system outages.
Node.js and PHP
Server-side integration logic in Node.js for high-frequency event-based scenarios and PHP for direct integration into shop systems. Both languages secured with comprehensive test suites.
Docker and CI/CD
Containerized integration services for identical conditions across all environments. Automated deployment pipelines ensure only tested code reaches production.
Monitoring and Alerting
Real-time monitoring of all data flows with configurable thresholds and escalation chains. Dashboards visualize throughput, error rate and latency for each interface.
GDPR-Compliant Architecture
We agree the operating location of the integration services with you; when operated in a cloud environment of your choice, it follows that environment. Personal data is transmitted encrypted and stored only as long as required for the processing purpose.
At a glance
Three ways to connect ERP and shop
Which route fits is decided by the system landscape, not by budget alone. A factual comparison of the common approaches.
Point-to-point in the shop
- Included: Very short path to the first working transfer
- Included: Low initial effort for exactly one data direction
- Not included: Every additional connection increases the number of dependencies
- Not included: Errors often surface only once data is wrong in the shop
- Not included: ERP updates require changes directly in the shop
Ready-made standard connector
- Included: Covers standard fields such as articles, stock and orders
- Included: Short setup time when the data model matches the standard
- Included: Ongoing licence costs, which we always itemise separately
- Not included: Custom business rules can often only be mapped to a limited extent
- Not included: Special cases tend to end up as manual work again
Integration layer after analysis
- Included: For every data field it is defined which system leads
- Included: Transformations, validation rules and error handling in one place
- Included: Repeated deliveries remain harmless thanks to idempotency
- Included: Setup fixed price from €1,490 net after a free initial assessment
- Not included: Higher initial effort than a single direct connection
Ready to connect your systems into one data flow?
We analyze your system landscape and quote a concrete fixed price per connection, from €4,900 net, before development starts.
Industries with particular integration needs
System integration is relevant in every e-commerce sector, but some industries place particularly high demands on data quality, synchronization frequency and business logic complexity.
Wholesale and Distribution
High-frequency stock changes from continuous goods receipt and picking require synchronization at intervals of seconds. Volume pricing, framework agreements and customer-specific conditions make price synchronization demanding.
Manufacturing Industry
Bills of materials, configuration variants and spare parts with complex dependencies require sophisticated data models. Integrating production systems for delivery date calculation goes beyond classic ERP connectivity.
Technical Specialized Trade
Standard-compliant product classification according to ETIM and ECLASS, extensive technical attributes and BMEcat catalog exchange place high demands on data mapping between PIM, ERP and shop.
What actually happens in live operation
Synchronization is not a nightly batch, but a continuous rhythm. This timeline shows how a stock change in the ERP reaches the shop within seconds, and how the middleware cleanly catches up after a brief outage; it is designed so that no record is lost.
- Real-time events instead of nightly bulk exports
- Automatic retries with growing wait times
- Reprocessing of all pending messages after recovery
The path to seamless data flows: What decision-makers should know
Whether and when a professional integration architecture pays off depends mainly on order volume and manual effort; in the initial call we work it out with your own figures. Automating manual data entry noticeably reduces the time required for order processing. The error rate in product data and prices drops considerably because automated synchronization avoids typos and forgotten updates.
At the same time, seamless data flows create the foundation for scaling. When your shop grows from 5,000 to 50,000 products, manual maintenance must not grow along. Maintenance stays in the leading system and the shop automatically receives current data. The same applies to new sales channels: a marketplace or B2B portal is supplied consistently through the central middleware.
Typical results after the first year of operation
Our recommendation: introduce in phases
Investment security through modular integration architecture
An integration architecture must endure for many years. ERP updates, shop relaunches and new sales channels must not jeopardize existing interfaces. That is why we rely on a modular architecture where every component is replaceable: the ERP connector can be changed without adapting the shop adapter, and an ERP migration in three years leaves the shop-side integration intact. Our operations contracts ensure professional operation after go-live: proactive monitoring, compatibility checks before system updates and quarterly optimization reviews.
What Shop Integration Costs
Blanket effort estimates are of little help for budget planning. That is why we quote clear fixed prices for the most common connections. The final price depends on your system landscape and the critical data flows and is fixed and binding after a free initial assessment. Ongoing third-party licenses for connectors, middleware and DATEV tools are shown transparently and separately.
Fixed Prices for Your Shop Integration
All prices net plus VAT. Every connection starts with a free initial assessment and a binding fixed price. Scope and system landscape determine the right path.
Single Connection
One clearly scoped interface connected cleanly.
- DATEV bookkeeping connection from €1,490
- Payment connection from €1,490
- Revenue account mapping and GoBD archiving
- Setup and test included
- Third-party licenses shown transparently and separately
ERP Connector
Bidirectional standard connection for common inventory systems.
- JTL-Wawi or Lexware from €4,900
- Microsoft Dynamics 365 from €6,900
- Products, prices, stock and orders in sync
- Marketplace per channel from €2,480
- Queue with automatic retry
Enterprise & Middleware
SAP integration and custom middleware architecture.
- SAP Business One or S/4HANA from €9,900
- Dedicated transformation and mapping layer
- Message queue with dead-letter handling
- Custom API development at €990 net per project day
- Load testing and go-live support
Support on a time basis €119 per hour, project day €990 net. Ongoing interface monitoring under a separate support agreement. Connector, middleware and DATEV third-party licenses are shown transparently and separately. You receive a binding quote after the free initial assessment.
Frequently asked questions about shop integration
Many companies face similar questions when planning the integration of their online shop with ERP and accounting. Detailed answers can be found on our FAQ page. Here are the most common questions in brief:
If you want to go deeper, our technical blog covers the background: REST API or Middleware compares the two architectural routes for ERP shop connections, Data Mapping Between ERP and Store shows how field assignments are defined cleanly, and Webhooks vs. Polling explains when synchronization should run event-driven.
Typical starting points
Examples, not client projects.