ERP integration for online sellers
E-commerce ERP integration so orders, stock and refunds stop being re-keyed
One set of numbers across your store, your marketplaces and your ERP.
We connect WooCommerce, Shopify, Magento and marketplaces to custom and packaged ERPs, with retry-safe sync and a reconciliation report finance can trust. We also say plainly when a connector is the cheaper answer.
Start with a free pilot of 2 to 3 key modules.
Who this is for
- You sell on a store such as WooCommerce, Shopify or Magento, on marketplaces such as Amazon, eBay, Noon or Daraz, or on several at once.
- Orders, stock or prices are re-keyed or uploaded in batches, and overselling, late shipments or reconciliation errors cost you money.
- Your ERP or accounting system is custom, or one of SAP Business One, NetSuite, Odoo, Business Central, QuickBooks, Xero or Zoho.
- More than one channel draws on the same stock, or finance needs fees, refunds and payouts posted correctly.
Not a fit
- You run one small shop and the platform's own accounting plugin already covers your needs. Use the plugin; this service would be over-engineering.
- You have no ERP or accounting system yet. Choose that first, then connect it. Our custom ERP page covers that path.
- You only need a one-off data import. A script or a spreadsheet import is cheaper than a running integration.
This page is for hiring the integration. For the general service across accounting, CRM, HR and payments, see ERP integration services, and if you still need the ERP itself, our custom ERP software page covers it.
Nine flows, their direction and how failures are handled
Every row is a decision made once, in writing, so the two systems never argue about whose number is right.
| Flow | Direction | Frequency | Typical failure | How the integration handles it |
|---|---|---|---|---|
| Orders | Channel to ERP | Real-time by webhook, with a scheduled catch-up | Missed or duplicated orders | Channel order ID stored as a unique key, so a repeat delivery is recognised and, by design, does not create a second sales order; failed imports wait in a retry queue |
| Stock levels | ERP to channel | On every movement for fast lines; scheduled for slow lines | Overselling when two channels draw on one pool | Available-to-sell is calculated once in the ERP and pushed to every channel, with an optional safety buffer on fast sellers |
| Prices and price lists | ERP to channel | On change, or scheduled | A campaign discount overwrites the list price, or margin reports drift | Base prices and campaign prices held separately, so a promotion ends cleanly and does not overwrite the list |
| Customers | Channel to ERP | With each order | Duplicate customer records | Matching on email and address rules before a new record is created; guest checkouts mapped to a channel account |
| Shipments and tracking | ERP or warehouse to channel | When the shipment is confirmed | Shoppers chase orders that already left | Shipment confirmation writes tracking back to the order, and partial shipments update only their own lines |
| Returns and refunds | Both ways | On each event | A refund with no matching stock movement or credit note | One written returns flow; refund, stock status and credit note linked by order reference; partial refunds handled per line |
| Payments, fees and payouts | Payment provider or marketplace to ERP | Per settlement or payout | Bank deposit does not match order totals | Settlement lines split into sales, fees, refunds and adjustments, then matched to the bank in a reconciliation report |
| Tax | Channel to ERP | With each order | Rounding differences between channel and ledger | Tax treated as received from the channel with the rounding rule agreed up front; exceptions listed, not silently adjusted |
| Products and variants | ERP to channel (content may stay in the channel) | On change, scheduled | A variant sold online that the ERP does not know | SKU mapping table with a check for unmapped items, including bundles that consume several ERP items |
Every failure above ends in the same place: an exceptions list that someone owns. A reconciliation dashboard compares order counts, totals and stock on both sides each day, so a problem is a ticket, not a customer complaint. The reasoning behind each choice is in our guide to ERP and e-commerce integration.
Which integration route fits WooCommerce, Shopify, Magento or a marketplace?
Check the platform's current API documentation before committing; limits and versions change. This table shows the usual route.
| Channel | Usual approach | Best when | What to watch for |
|---|---|---|---|
| WooCommerce | REST API and webhooks | You want live orders and stock on a store you host yourself | Order status mapping, variations, and plugins that add fields or bundles; hosting speed affects webhook delay |
| Shopify | GraphQL Admin API and webhooks | Orders and inventory by location need to reach the ERP in near real time | Delivery of webhooks is not guaranteed, so a scheduled comparison is part of the design |
| Magento / Adobe Commerce | REST or GraphQL APIs, plus queues for large catalogues | Large catalogues, multiple store views, or B2B price rules | Catalogue size and custom extensions; bulk updates are better batched than sent one by one |
| Marketplaces (Amazon, eBay, Noon, Daraz and similar) | Marketplace seller APIs, report downloads or file feeds | You list the same stock on several marketplaces | Rate limits, listing rules, marketplace-held stock as its own location, and settlement files that mix sales, fees and refunds |
The ERP side
Custom ERP
We design the integration interfaces into the ERP itself, so the channel flows are built in rather than bolted on.
SAP Business One, NetSuite, Business Central, Odoo
Reached through each product's documented APIs and import tools, alongside your ERP partner when a change is needed inside the product.
QuickBooks, Xero, Zoho
Usually posting summarised sales, fees and refunds rather than every line, because these tools are accounting-first.
If the store itself needs building or replatforming, see e-commerce development. Where the connection spans many systems, systems and API integration and API development describe the wider work. We name these platforms as systems we integrate with; this implies no partnership with any of them.
Connector, integration platform or custom integration?
Many sellers should buy a connector. This table shows where each route is stronger, so you can choose on fit.
| Question | Off-the-shelf connector | Integration platform (iPaaS) | Custom integration |
|---|---|---|---|
| Best when | One store, one mainstream ERP, standard process | Several systems, and someone in-house can run the flows | Shared stock across channels, a custom or older ERP, or finance rules that vary |
| Control of rules | Limited to the connector's settings | Good for standard steps; complex rules get hard to read | Full: rules are written to your order of precedence |
| Marketplace and fee handling | Depends on the connector | Depends on the available building blocks | Built to the settlement files you actually receive |
| Who watches it | You, with vendor support | You, or the platform's partner | Monitoring and alerts built in, with support under a service level agreement |
| Running cost | Subscription that often grows with orders | Subscription plus the time to maintain flows | Hosting, monitoring and change requests when a platform API changes |
| Ownership | Vendor controls the roadmap | Flows live on the vendor's platform | Source code transfers to you on full payment |
A custom integration is worth it when
- Two or more channels sell from one stock pool and a single allocation rule must decide who gets the last unit.
- Your ERP is custom, older or not supported by the connectors on the market.
- Bundles, kits, made-to-order items or B2B price lists do not map cleanly.
- Finance needs fee-level posting from marketplace settlements.
- Monthly connector fees have grown with order volume and the sum now rivals a one-off build.
What it costs to run, whichever route you pick
- Hosting for the integration service and its queue
- Monitoring, alerting and someone who looks at the exceptions list
- Updating the integration when a platform changes its API or versions
- Support under a service level agreement, with response targets agreed per severity in the contract
Timeline Digital does not publish prices for custom software, because every project is custom.
How the free pilot works
See working software before you commit to the full project.
Timeline Digital starts every e-commerce integration with a free pilot. You contact us, we agree the 2 to 3 key modules that prove the integration, we build them as working software at no charge, and your team tests them. You decide on the final agreement only after testing, so you judge the work before you commit to anything.
You contact us
Tell us your channels, your ERP and where orders, stock or refunds go wrong today. A mutual NDA can be signed before you share sensitive details.
We agree the 2 to 3 key modules
Together we choose the flows that prove the integration, for example order import and stock sync first. Returns and payment reconciliation can follow.
We build the pilot and you test it
We build those flows as working software, free of charge, against a sandbox or sample data. Your team uses it and tells us what is wrong.
You decide on the final agreement
The full project starts only after you approve the pilot. Scope, milestones and terms are agreed in writing after it, not before.
Understand, Plan, Select Technology, Pilot, Build and Scale
The same five steps run every project. For an e-commerce integration each step has a specific job.
- Step 1
Understand
We map each channel, the ERP, who owns every record and the exceptions that cost you money: oversold lines, split shipments, refunds without returns.
- Step 2
Plan
Flows, directions, SKU mapping, the returns policy and the reconciliation report are written down, and the pilot flows are chosen with you.
- Step 3
Select technology
We choose the route from the platform table above: direct APIs, a queue between systems, marketplace feeds or an existing connector kept in place.
- Step 4
Pilot
Two or three flows run end to end on sandbox or sample data, so you see a real order land in the ERP and stock return to the channel.
- Step 5
Build and scale
After approval: remaining flows, tests with replayed real orders, a rehearsed cutover, monitoring switched on, then support.
Before cutover we test with copies of real products and replayed orders on sandbox data, and after launch we monitor failed messages and run the reconciliation report. We need API access to each platform, test environments, and a named person to sign off the mappings. Delivery is remote with video meetings in your working hours; our hours are Monday to Friday, 9:00 to 18:00 Pakistan time (PKT, UTC+5). Stores that also sell in branches may need retail management software or a custom POS in the same stock pool.
E-commerce ERP integration questions buyers ask
Can WooCommerce integrate with my ERP?
Yes. WooCommerce exposes a REST API and webhooks, so orders can flow into the ERP while stock, prices and product data flow back. The design depends on your ERP, your plugins and your hosting. We assess these first and confirm the approach before building. For the design detail, read our ERP and e-commerce integration guide.
How do I stop overselling across Shopify and Amazon?
Keep one stock pool in the ERP and push available-to-sell quantities to every channel, not raw on-hand stock. Update fast-moving lines on every movement, hold a small safety buffer, and run a scheduled comparison to catch missed updates. Marketplace-fulfilled stock should be its own location, so the pool stays truthful.
Do I need middleware to connect my store to an ERP?
Not always. One store and one mainstream ERP can use a direct API link or a maintained connector. Add a queue or integration platform when several channels, retries and monitoring matter. The test is simple: if a failed message would be lost, you need something that stores and replays it. See integration patterns.
What happens to returns and refunds in the integration?
Each return is linked to its original order. The refund, the stock status (resaleable, damaged or written off) and the credit note are posted together and matched by order reference, so finance can tie them to the payout. Partial refunds, refunds without a return and marketplace-initiated refunds are decided in the planning step.
Should I buy a connector or build a custom integration?
Buy a maintained connector when you have one store, a mainstream ERP and standard processes. Build custom when channels share stock, the ERP is custom or older, bundles and B2B prices do not map, or finance needs settlement-level posting. Compare both on your own orders first; we will say honestly if a connector fits.
Can you connect Amazon, eBay, Noon or Daraz to my ERP?
Often, depending on what each marketplace offers sellers: documented APIs, report downloads or file feeds, within its rate limits and rules. We assess each one before promising a design. Tell us the marketplaces, order volumes and ERP, and we will say what is feasible. Check the platform's current API documentation too.
Can the CRM and the ERP both connect to my online store?
Yes. The usual rule is one owner per record: the store owns the checkout, the ERP owns stock and accounting, and the CRM owns sales conversations. Customers and orders then reach the CRM and the ERP from the same event. See ERP and CRM integration for the field-level view.
How does the free pilot work?
You contact us and we agree the 2 to 3 key flows to prove, for example order import and stock sync. We build them as working software, free of charge, and your team tests them on sandbox or sample data. You decide on the final agreement only after testing, so nothing is committed before then.
How long does an e-commerce ERP integration take?
There is no fixed timeframe: the schedule for your e-commerce integration is set from your requirements in the Plan step. A free pilot of 2 to 3 key modules comes first, you test it, and the full project starts only after you approve it. Long-term support under a service level agreement (SLA) follows launch.
How much does e-commerce ERP integration cost?
Timeline Digital does not publish prices for custom software, because every project is custom. The price follows the channels, flows, ERP, monitoring and support you need. It is agreed in writing after requirements analysis and the free pilot, and any change outside the approved scope is agreed with you before extra work begins.
Who owns the connector and mapping code?
You do. Connector, field-mapping and queue code transfer to you on full payment, with documentation, so you can host it where you choose and have another team maintain it. Credentials for your platforms stay in your own accounts. Third-party platform software and licences stay with their providers.
Guides for this decision
In-depth, practical reading for teams planning this kind of project.
- Guide · 9 min readERP and E-Commerce Integration: Shopify, WooCommerce and AmazonERP and e-commerce integration keeps orders, stock, prices and returns consistent between your online channels and your back office. This guide covers which system should own each record, sync patterns, platform API basics and a test checklist.Read the guide
- Guide · 10 min readERP and CRM Integration: What to Sync and HowERP and CRM integration lets sales see credit, orders and invoices while finance gets clean customer records and accurate orders. This guide sets out what to sync, which system owns each field, sync patterns and pitfalls.Read the guide
- Guide · 10 min readEnterprise Integration Patterns: Point-to-Point vs Middleware vs Event-Driven, and How to ChooseEnterprise system integration is a set of patterns, not one technology. This guide describes the topologies (point-to-point, hub, bus, event-driven) and the message patterns (request-reply, publish-subscribe, batch, change data capture, outbox) and gives a decision table based on how many systems you have, how fresh the data must be and who will run it.Read the guide
- Guide · 10 min readSystem Integration Approaches: Point-to-Point, Middleware, iPaaS or Events?Point-to-point APIs, middleware, iPaaS, event-driven and file-based integration each fit different situations. This guide compares them, then covers the decisions that matter more than the pattern: system of record, idempotency, retries, error queues, reconciliation and security.Read the guide
Tell us your channels and your ERP, and see the sync working first
Send the platforms you sell on, your ERP and the flow that hurts most. We reply with the 2 to 3 modules we would pilot, or an honest note that a connector fits you better.
Start with a free pilot of 2 to 3 key modules.
About this page
Platforms are named as systems we integrate with; no partner status, certification or compliance is claimed, and each integration is confirmed against the platform's current documentation per project.
Author
Usama Asif
CEO and CTO, Timeline Digital.
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