ERP Integration for E-Commerce and B2B Dealer Portals: A Practical Guide

An order lands on your online store. Someone opens it and types it into your accounting system by hand. Stock goes down in the warehouse, but the website still shows the old number. An hour later the same product sells on a marketplace too, but it's no longer in stock. The customer gets a call, an apology and a cancelled order.

This happens every day in businesses where the ERP or accounting system isn't connected to their sales channels. ERP integration removes exactly this gap. In this guide we explain what integration is, which data moves and how, which methods are used, and the problems that come up most often in real projects.

What is ERP integration?

ERP integration means automatically connecting the accounting or resource planning system your business uses, such as Logo, Mikro, Netsis, Paraşüt or SAP, to your online store, marketplace shops, B2B dealer portal and other software.

Once integration is in place, information is entered once and flows everywhere else on its own. A product is created in the ERP and appears on your site. An order is placed on your site and lands in the ERP. Stock drops in the warehouse and updates across every sales channel.

What data is transferred?

Product information

Product code, name, description, barcode, unit, variants (such as color and size) and category. Product records usually live in the ERP and are pushed out to other channels.

Stock

This is the most critical part of integration. The more up to date stock levels are, the fewer out-of-stock sales and cancelled orders you'll have. If you have multiple warehouses, you also decide which warehouse's stock is shown in which channel.

Prices

List prices, campaigns, channel-specific prices and, on the B2B side, dealer-specific prices and discounts. Tax-inclusive or exclusive display and foreign currency prices are part of this too.

Orders

Orders from your site, marketplaces or dealer portal are created in the ERP as sales orders or delivery notes, together with customer and shipping details. Order status (processing, shipped, delivered) flows back to the sales channel.

Customer accounts and invoices

New customers are created as accounts in the ERP. On the B2B side, dealers see their account balance, statements and invoices in the portal. E-invoicing is often part of this flow as well.

Which direction does data flow?

When planning an integration, the "source of truth" for each type of data is defined. A typical setup looks like this:

• From the ERP to sales channels: product records, stock, prices, account balances, invoice data
• From sales channels to the ERP: orders, new customers, online payments

This separation matters. If the same information can be edited in two places, it becomes unclear which one is correct, and the data slowly drifts apart.

Which systems can be integrated?

In Turkey, the most widely used systems include Logo, Mikro, Netsis and the cloud-based Paraşüt. In retail, Nebim is common; larger companies often use SAP.

On the sales side, the other end of the integration is your own online store, marketplaces such as Trendyol, Hepsiburada and Amazon, your B2B dealer portal, shipping carriers and payment providers.

Integration methods

APIs and web services

The healthiest method, where systems talk to each other under defined rules. Many ERPs offer web services or APIs for this purpose. In some versions this requires an additional module or license, so it's worth confirming with your ERP vendor before starting.

Middleware

A layer of software sits between the ERP and your sales channels, transforming and routing data. When connecting multiple channels to a single ERP, it makes data mapping and error tracking much easier.

File transfer

Exchanging data at set intervals using Excel, XML or CSV files. It's easy to set up but not real-time, and the risk of errors is higher. It can be a starting point for low-volume businesses.

Real-time or scheduled?

Not all data needs to be updated at the same frequency. Stock and orders should be synced as often as possible, ideally in real time, because even a few minutes of delay can cause problems during busy sales periods. Rarely changing information like product descriptions or categories can be updated once a day. The right frequency balances system load and error risk.

Common problems in integration projects

• Mismatched product codes: if the code in the ERP differs from the one on your site or marketplace, the system can't recognize it as the same product.
• Incompatible variant structures: the ERP may store each color and size as a separate product, while the site needs them as variants of one product.
• Price and tax confusion: mixing tax-inclusive and exclusive prices leads to orders at the wrong price.
• Duplicate records: the same customer or order is created twice.
• Unnoticed errors: an order that fails to transfer sits there without anyone noticing. Good integration logs failed operations and sends alerts.

How does an integration project work?

1. 1Review of the current setup: your ERP and version, sales channels and business rules
2. 2Data flow planning: which data moves in which direction, and how often
3. 3Data cleanup and code mapping
4. 4Development and testing in a staging environment
5. 5Controlled rollout with real orders
6. 6Monitoring, error alerts and support

Frequently asked questions

Do I need to replace my ERP?

Usually not. Widely used systems like Logo, Mikro, Netsis and Paraşüt support integration. What matters is that your version and license allow data exchange with external systems.

Off-the-shelf connector or custom development?

If you run a single online store and a standard ERP, ready-made connectors may be enough. If you need multiple channels, dealer-specific pricing, custom approval rules or multiple warehouses, custom development usually gives better results.

How long does integration take?

It depends on the number of systems, what your ERP supports and how clean your data is. A simple single-channel integration can be done in a few weeks, while projects covering multiple channels and a B2B portal take longer.

Can marketplaces be included in the same integration?

Yes. Marketplaces like Trendyol, Hepsiburada and Amazon can also be connected to your ERP, so stock is managed centrally and a sale in one channel is instantly reflected in the others.

Is integration a one-time job?

No. ERP updates, changing marketplace rules and new business needs mean integration requires regular monitoring and maintenance.

Conclusion

ERP integration manages your data from a single source and eliminates manual entry, stock errors and wrong prices. As your sales channels grow, it stops being a convenience and becomes essential to running the business smoothly.

If you work with a dealer network, take a look at our guide to B2B dealer ordering portals; dealer orders are one of the areas where integration makes the biggest difference. We work remotely with businesses across Turkey and abroad. Let's talk about your ERP and sales channels in a short call and find the right integration approach together.