Order processing workflow with validation and conditional branching handles incoming orders through a decision gate that routes valid orders to payment and fulfillment or invalid orders to customer rejection notification. The flow moves from order receipt through validation, then splits into two parallel paths: successful orders proceed to payment processing and shipment while rejected orders trigger customer notification. This pattern demonstrates essential error handling and customer communication in e-commerce systems. Fork this diagram on Diagrams.so to customize validation rules, add payment gateway details, or integrate with your order management system. Consider adding retry logic or escalation paths for edge cases like payment failures or inventory issues.