Turn your existing platform into an eCommerce marketplace solution without changing your core stack
Mercur is a multi-vendor marketplace platform that can be integrated with any eCommerce, ERP-driven, or custom-built platform – adding multiple vendor workflows and marketplace functionality, while your core commerce engine stays untouched.
- No migration, no replatforming, no vendor lock-in
- No need to pause current eCommerce development
- Works with custom and legacy platforms
- Clear separation between commerce and marketplace logic
- API-first, event-driven integration
Is the Mercur multi-vendor eCommerce platform integration for you?
This marketplace integration is designed for business owners who are looking for a scalable online marketplace model – without risking their existing ecosystem.
Not every business runs on an off-the-shelf eCommerce platform, like Shopify or Magento. For many organizations, the commerce stack is deeply embedded in internal systems, processes, and domain-specific logic.
In this exact case, a custom marketplace integration with Mercur makes the most sense.
- Your storefront and checkout are developed in-house
- Your core logic is tightly coupled with internal systems
- Replatforming would be risky, slow, or unnecessary.
- Your business-critical system was built years ago
- You rely heavily on customization and integrations
- You can't add marketplace features without destabilizing the commerce core
Why choose Mercur as eCommerce marketplace solution
Mercur works as a multi-vendor marketplace software connected to your eCommerce store. It supports your long-term growth without risking changes to your existing commerce core.
Reduce development and maintenance costs by keeping multi-vendor eCommerce marketplace logic out of your current tech stack.
With Mercur, you avoid recurring vendor fees and lock-in, while keeping full ownership with open code to customise limitless.
Operate your marketplace on top of your eCommerce business with full platform ownership.
Mercur keeps marketplace responsibilities separate from your commerce core, with predictable integration points, and no vendor lock-in at the marketplace layer.
Mercur connects to your store through APIs and event-based communication, so seller accounts, product listings, and marketplace rules remain stable even when storefront technology changes.
Develop your eCommerce store and Mercur multi-vendor marketplace independently, without one limiting the other.
Marketplace logic runs in Mercur, so growing numbers of sellers, rules, and workflows do not interfere with your store's performance or core commerce operations.
Keep your eCommerce marketplace platform running even if your long-term roadmap includes changes to the frontend, checkout, or commerce engine.
Mercur remains your engine while each of your stack can be replaced gradually, without breaking marketplace logic.
How Mercur integration works with your existing system
Mercur was designed as a standalone marketplace engine. It acts as a multi-vendor marketplace integration that adapts to your current stack through clear, predictable interfaces — without assuming how your commerce works internally.
One of the biggest risks in marketplace projects is unclear ownership of logic. A successful custom integration starts with a clean separation of responsibilities.
- Product master data (if already owned)
- Checkout and payments
- Customer accounts and identity
- ERP, PIM, OMS, and internal workflows
- Domain-specific business logic
How they communicate
API-first integration
Event-based synchronization
Headless-friendly by design
Systems can scale independently
- Admin and seller management
- Multi-vendor product offers
- Commission, fees and payout rules
- Order splitting per seller
- Seller onboarding and workflows
This separation
Reduces integration complexity
Protects your core systems
Allows marketplace logic to evolve independently
Discover Mercur marketplace platform capabilities
Mercur marketplace logic runs separately, as a marketplace integration, allowing your system to stay focused on commerce.
Custom integrations are not edge cases. They are often the right choice for platforms operating outside classic eCommerce patterns.
Create a marketplace where multiple sellers can offer the same product with different prices, stock levels, and conditions. Product offers stay vendor-specific, while your catalog remains clean and consistent.
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Give each vendor an interface to handle their own products, orders, customer base, tax logic, transaction fees, availability, and shipping rules. Marketplace owner keeps full control over marketplace workflows, while merchants manage their daily operations without access to other admins or sellers' profiles.
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Define commission rules, fees, and settlement models, per vendor or product category. Handle them outside the system core, reducing custom development inside the eCommerce platform.
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Customers place a single order through your existing checkout. Order details are automatically split into seller-specific orders, with separate fulfillment, secure payment processing, shipping, advanced inventory management, and refund flows for each marketplace vendor.
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Manage vendor registration through structured onboarding workflows. Verification steps, contract handling, and seller activation are designed for automated operations.
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How companies use Mercur in practice
If your business model values speed today but needs a platform model for tomorrow – your existing system + Mercur gives you the structure to scale it safely.
This setup is already proven across retail expansion, complex B2B marketplace platforms, and other marketplace models.
Multiple suppliers, contract pricing, ERP-driven catalogs, and non-standard order flows — with Mercur vendor management logic on top.
Multi-vendor platforms where transactions are tied to availability, fulfillment steps, or human workflows, not just products.
How is Mercur multivendor marketplace engine designed for any eCommerce architecture
Mercur is not tied to any specific commerce platform. It was designed from day one to adapt to existing systems through clear, predictable interfaces.
Custom integrations need to survive platform changes, system replacements, and new business models. Mercur is designed to be the stable marketplace core in a changing ecosystem.
- Proven marketplace engine instead of greenfield logic
- Clear separation between marketplace and transactional systems
- Predictable integration points (APIs and events)
- Ability to limit scope and iterate safely
- Hard-to-maintain custom extensions
- Marketplace logic buried inside core systems
- Costly rewrites when the business model evolves
Mercur can sit next to:
- Custom storefronts
- Headless commerce backends
- ERP-, OMS- or PIM-centric architectures
Multi-vendor eCommerce platform development process
Adding the marketplace to your existing system doesn’t have to be a multi-year transformation. This eCommerce marketplace software can be rolled out step by step, starting with a focused MVP.
- No rewrite of existing systems
- No need to pause current eCommerce development
- Marketplace can grow at your pace
- Scale operations without rewriting logic
- Stay flexible as the business model evolves
Define your own online marketplace model, seller types, commission logic, and integration scope with our technical expertise.
Get a clear split of responsibilities between your system and Mercur, aligned with your existing ERP, PIM, and OMS. API contracts, events, and data ownership are defined before any heavy implementation starts.
Start building your multi-vendor marketplace today
Before building anything, it’s worth validating how a multi-vendor marketplace should live in your ecosystem. A short architecture conversation can save months of development and years of technical debt.
Connect your commerce foundation with Mercur to turn it into a fully functional marketplace platform.
- Discuss your multi-vendor marketplace model and constraints
- Define the right responsibility split
- Validate if Mercur is the right fit
- Get a high-level architecture recommendation: Shopify + Mercur, Magento + Mercur, or custom
