【無料のC4図作成ツール】システム構造をレベル別にわかりやすく整理

C4Context title EC Platform Person(customer, "Customer", "Buys products") System(platform, "EC Platform", "Order and payment") System_Ext(payment, "Payment Gateway", "External payment provider") Rel(customer, platform, "Uses") Rel(platform, payment, "Charges")