B2B wholesale platforms operate on fundamentally different mechanics than consumer e-commerce, with multi-step approval workflows, complex credit relationships, and regulatory requirements that demand careful system design. When a buyer wants to purchase 10,000 units on net-30 terms, you can't simply process the transaction like a standard checkout. The architecture must intelligently route requests through approval workflows, enforce credit limits, and maintain audit trails for compliance, all while keeping response times competitive.
Architecture Overview
A robust B2B wholesale platform sits at the intersection of commerce, finance, and operations. The core components include a product catalog service optimized for bulk queries and tiered pricing calculations, a quote engine that generates custom pricing based on volume and buyer history, and a purchase order management system that acts as the central orchestrator for transactions.
Behind these customer-facing services lies a critical approval workflow engine that evaluates each PO against multiple business rules. This engine connects to a credit management service that tracks customer credit limits, utilization, and payment history. A separate notification service alerts stakeholders when actions are required, while an audit logger captures every decision for compliance and dispute resolution. The architecture also includes integration points for accounting systems, shipping platforms, and third-party payment processors that handle net-30 settlements.
The key design decision here is separation of concerns. Rather than embedding approval logic directly in the PO service, a dedicated workflow orchestrator handles the decision tree. This makes it easy to adjust rules, add new approval stages, or integrate with external credit bureaus without redeploying core services. Real-time data consistency matters less than eventual consistency, so services communicate asynchronously where possible, reducing coupling and improving resilience.
Design Insight
When a purchase order exceeds a buyer's credit limit, the approval workflow doesn't simply reject the request. Instead, it triggers a multi-stage escalation process. The system first checks if the order quantity or total value violates any hard limits set by the account manager. If it does, the PO status shifts to "pending approval," and the workflow notifies the appropriate decision-maker, typically the account manager or credit team.
This is where intelligent routing becomes essential. The system evaluates several factors: the buyer's payment history (have they always paid on time?), their existing utilization rate (are they near the limit or far below it?), and the order's profitability. A long-standing customer with excellent payment history might get automatic approval for a modest overage, while a newer buyer triggers manual review. Some workflows even allow conditional approval, such as "approved if prepayment of 25% is received." The audit trail records who approved the exception, why it was granted, and under what conditions, protecting both the business and the buyer in case of disputes.
Watch the Full Design Process
See how AI generates this architecture in real-time, responding to the credit limit challenge and evolving the system based on follow-up questions:
Try It Yourself
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