OpenCart Integration for ERP, Warehouse and Couriers
OpenCart integration by Saitami connects an existing OpenCart 3.x or 4.x storefront to your ERP, warehouse, accounting and couriers Speedy and Econt. Many Bulgarian online shops run on OpenCart and lose hours daily on manual order copying — our integration eliminates it with real-time two-way sync.
What our OpenCart integration includes
Products and variants two-way
Catalog sync between ERP and the OpenCart catalog/product API — attributes, options, size and color variants, images, categories and SEO fields. Changes in ERP reach the storefront in under a minute, with no manual CSV import in the admin panel.
Real-time stock by warehouse
Live stock from one or many warehouses is pushed to the OpenCart quantity field on every change. A reserved buffer per SKU prevents overselling, and multi-warehouse aggregation lets OpenCart show one combined quantity from all physical locations.
Orders from OpenCart to ERP
A new OpenCart order drops into ERP as a full document with customer, address, items, payment method, shipping and totals. Dedupe by order_id, idempotency against webhook retries and a full audit trail from OpenCart order ID to ERP document number.
Status webhooks back to the store
When ERP changes a status — confirmed, packed, shipped, delivered, returned — the webhook bridge writes the event to the OpenCart order_status table with the real AWB from Speedy or Econt. Buyers see an accurate status in My Orders without operator email.
Customers and B2B price tiers
Sync of registered customers, customer groups and address books between OpenCart and ERP. Support for B2B price tiers — dealer, wholesale, corporate pricing per group, volume discounts and key-account pricing, all driven from ERP into OpenCart customer_group_id.
Translations and Speedy/Econt in admin
Multilingual sync of descriptions and attributes in Bulgarian and English via OpenCart language tables. Speedy and Econt integration — AWB generation, label printing, tracking — directly from OpenCart admin order screens. OpenCart extension or external bridge by choice.
Who it is for
Mid-size Bulgarian OpenCart retailers
Online shops with 1,000 to 30,000 SKUs running on OpenCart 3.x for years that do not want a platform restart. You get an ERP-grade back office on top of the same store — orders flow into accounting and stock comes from the real warehouse.
OpenCart multistore setups
Merchants running several storefronts under one OpenCart instance — separate brand stores, BG and EN regional versions, or a franchise model on a shared catalog. Multi-store config is supported natively with per-store pricing and rules.
Distributors on an OpenCart wholesale portal
B2B distributors and wholesalers running an OpenCart-based dealer portal. Customer groups with dealer prices, minimum order quantities, ERP-checked credit limits and per-client catalogs turn OpenCart into a real wholesale channel.
How we build your OpenCart integration
1. OpenCart audit and mapping
We audit the instance — OpenCart 3 or 4, current extensions, theme mods, multi-store layout, product and order volume. We document the mapping between OpenCart product_id, model, sku and your internal ERP identifiers to avoid duplicates and zeroed stock after the first sync.
2. OpenCart REST API and event extension
We connect through the official OpenCart REST API for catalog, orders and customers. For real-time events we build a lightweight OpenCart extension on OCMOD that listens on product.save, order.add and customer.update and fires a webhook to our bridge — no core file hacks.
3. Webhook bridge with queue-based sync
The webhook bridge is a separate Node.js or .NET service with a BullMQ queue. Pull workers call the OpenCart REST API on interval for safe reconcile, push workers react to extension events. Rate limiter, idempotency keys and exponential backoff retry.
4. Two-way ERP link and observability
We wire the bridge into your ERP system and online store architecture. Every call is instrumented — see also our API integrations for parallel channels.
Why Saitami
manual order processing
every OpenCart order enters ERP automatically with full data and AWB
more accurate cross-store inventory
for multi-store OpenCart setups with shared stock from one warehouse
starting investment
OpenCart 3.x or 4.x link, orders and stock sync, base ERP mapping
Related: Shopify integration for brands migrating to cloud and Speedy and Econt integration for full courier automation. See also contact for a concrete quote.
Frequently Asked Questions
OpenCart 3 vs 4 — does it matter for the integration?
It does, but both versions are fully supported. OpenCart 4 has a more modern REST API with Twig templating and a cleaner event system, while OpenCart 3 relies on vQmod or OCMOD for extensions. Our webhook bridge abstracts the difference, so ERP integration logic stays identical. If you are still on OpenCart 2.x, we recommend upgrading first because of older API limits.
Does it support OpenCart multi-store configuration?
Yes, multi-store is a first-class scenario. One OpenCart instance with several store_id values shares a common catalog and shared stock, but each store can have its own price list, currency, languages and customer groups. The integration allocates inventory by store rule and prevents double-selling the last unit across the multistore setup at peak hours.
Can you write a custom OpenCart extension for my case?
Yes. When the standard REST API does not cover a workflow — specific payment hooks, custom shipping logic, B2B order approval — we build a dedicated OpenCart extension on the OCMOD standard. The extension installs through the admin Extension Installer, does not modify core files and survives minor OpenCart upgrades without conflicts during release cycles.
How much does OpenCart integration cost?
A standard OpenCart integration for a single store on version 3.x or 4.x, order and stock sync, status flow and base ERP mapping starts at €1,600 one-off. Multi-store setups with several storefronts, B2B price tiers, a custom extension and Speedy or Econt integration typically land between €3,200 and €6,800. Maintenance is €180–€420 per month depending on traffic.
Ready to automate your OpenCart store?
Share your OpenCart version, SKU volume, current ERP and couriers. You will get a concrete OpenCart integration plan with pricing and timelines.
Request OpenCart integration →