Integrating B2B trade credit with ERP. How to automate limits in 2026?
TL;DR - Quick summary
- No sales blocks: B2B + ERP integration unlocks 24/7 trade credit without manual sales approval.
- Real-time: MedusaJS v2 plus NestJS check exposure in milliseconds before orders confirm.
- Headless vs SaaS: own stack avoids take-rates on large B2B tickets like Shopify Plus.
- Budget: GMI Software is the only Polish software house with a fixed-price guarantee after DDT.
The problem: your top B2B buyer cannot finish checkout
Friday 9pm - a strategic buyer places an PLN 80,000 order. Cards and instant transfers are out; they hold PLN 150,000 credit and 30-day invoice terms.
A legacy Magento without finance sync misses morning payments. The UI says: "Credit limit exceeded. Contact sales." They leave for a competitor whose portal tells the truth.
GMI Software (Gdańsk, 16+ years) ships B2B trade credit as a first-class payment method synced with accounting.
Manual review vs automated ERP APIs
Why finance and ecommerce invest in automation:
- Manual: orders sit “pending”, CS logs into ERP (Subiekt, Comarch, SAP) each morning. Outcome: 12-24h delays, human error, ops cost.
- API: opening the Next.js cart triggers a ~0.2s ERP balance check. At PLN 50,000 limit and PLN 40,000 cart, labels release instantly with ledger entries automated.
How we connect B2B carts to heavy ERPs (GMI stack)
Raw storefront traffic would starve ERP - we add middleware:
1. MedusaJS v2 (commerce core)
Node.js headless B2B rules, no per-transaction rent, flexible payment methods.
2. NestJS + Redis (middleware)
NestJS services translate contracts and cache balances in Redis. Short SAP outage? Event queues accept the order and reconcile when finance is back.
3. CRM synergy
We wire the same signals into Berg System CRM so account managers see live buyer behaviour.
The architecture survives serious volume - e.g. SFD at 100,000+ downloads and 4.9★ on the App Store.
What does trade-credit B2B cost?
Automating finance policy needs tight analysis and code.
- Integration: MedusaJS, Next.js and ERP APIs typically PLN 160,000-240,000; advanced split payments or multi-level carts often land PLN 200,000-300,000.
- Timeline: first production release usually three to six months.
Scope creep dies in DDT - we document payment paths, then offer a fixed-price guarantee. Unique among Polish software houses in this model. After launch you own 100% of the code with no lock-in.
Frequently asked questions
- What is trade credit in B2B ecommerce?
- A checkout payment method (e.g. 30-day invoice) without cards or bank redirects. Orders proceed while amounts consume the credit line stored in finance per the B2B contract.
- Why must a B2B store integrate with ERP?
- Without integration the storefront cannot see cleared invoices. Every deferred order needs manual approval, automation dies and shipments slip up to 24 hours.
- Why does GMI Software recommend MedusaJS for B2B?
- MedusaJS v2 is Node.js, API-first, open source and free of SaaS take-rates (e.g. Shopify Plus). Custom credit rules ship without brittle plugins.
- Must the B2B stack query ERP on every click?
- No. We cache balances with Redis and NestJS services, sync in the background and keep Next.js UX under about a second.
- What is DDT and how does it protect budget?
- DDT (Discovery, Design & Technology) is pre-contract workshops: specs, ERP API maps and clickable UX mocks. The output is a fixed-price guarantee on the agreed scope.
Content updated: March 31, 2026