C4Container
    title BizTalk Runtime - Container View
    Person_Ext(customer_user, "Customer", "Submits orders and receives status")
    Person_Ext(supplier_user, "Supplier", "Sends invoice and product feed")
    Enterprise_Boundary(bt_enterprise, "BizTalk Integration Platform") {
        Boundary(bt_entry, "Entry and Receive", "Domain") {
            Container(portal, "Portal", "Customer Web App", "Customer-facing order capture and confirmation")
            Container(biztalk_receive, "INT1337-RCV-Order-Incoming", "FILE / FTP / SFTP / SOAP / REST", "Ingress adapters and receive pipelines")
        }
        Boundary(bt_processing, "Process and Transform", "Domain") {
            Container(biztalk_orch, "BizTalk Orchestrations", "XLANG/s", "Stateful process orchestration")
            Container(biztalk_map, "BizTalk Maps", "XSLT", "Canonical message transformation")
            Container(biztalk_rules, "Business Rules Engine", "BRE", "Routing and policy decisions")
            Container(biztalk_send, "INT1337-SND-Confirm-Outgoing", "SOAP / REST / SQL / FILE", "Outbound transport adapters")
            Container(pln_scheduled, "INT1337-PLN-Order-Scheduled", "Integration / JSON", "Publishes production schedule confirmation")
            Container(pkg_packed, "INT1337-PKG-Order-Packed", "Integration / XML", "Confirms order packed for transport")
            Container(dlv_delivered, "INT1337-RCV-Order-Delivered", "Integration / PSV", "Captures delivery confirmation")
            Container(inv_invoiced, "INT1337-INV-Order-Invoiced", "Integration / JSON", "Issues final invoice")
        }
        Boundary(bt_persistence, "Messaging and Persistence", "Domain") {
            ContainerDb(biztalk_messagebox, "BizTalk MessageBox", "SQL Server", "Store, publish, and dispatch messages")
            ContainerDb(biztalk_tracking, "BizTalk Tracking Database", "SQL Server", "Operational and business tracking")
            ContainerDb(finance_sql, "ERP-Finance SQL Database", "SQL Server", "Invoice persistence")
            ContainerQueue(planning_bus, "Planning Event Bus", "Azure Service Bus", "Schedule event queue")
            Container(file_drop, "Partner File Share", "SMB / FILE", "Legacy batch exchange")
        }
    }
    Container_Ext(erp, "ERP", "SOAP API", "Order and inventory domain")
    Container_Ext(erp_finance, "ERP-Finance", "SOAP API", "Invoice and payment domain")
    Container_Ext(wms, "Warehouse Management System", "FILE / REST", "Fulfillment domain")
    Container_Ext(payment_gateway, "Payment Gateway", "External REST API", "Processes customer credit card payments")
    ContainerDb_Ext(carrier_tracking, "Carrier Tracking DB", "External Database", "Provides delivery confirmation status")
    ContainerQueue_Ext(edi_gateway, "EDI Gateway", "External Message Queue", "B2B document exchange")
    Rel(customer_user, portal, "Place order", "HTTPS / JSON")
    Rel(portal, biztalk_receive, "Submit order", "REST")
    Rel(supplier_user, biztalk_receive, "Invoice and product files", "SFTP")
    Rel(biztalk_receive, biztalk_messagebox, "Publish inbound message", "SQL")
    Rel(biztalk_messagebox, biztalk_orch, "Dispatch orchestration", "SQL")
    Rel(biztalk_orch, biztalk_map, "Request canonical transform", "XSLT")
    Rel(biztalk_orch, biztalk_rules, "Evaluate policy", "BRE")
    Rel(biztalk_orch, biztalk_send, "Send transformed message", "In-process")
    Rel(biztalk_send, erp, "Order create/update", "SOAP")
    Rel(erp, planning_bus, "Publish schedule event", "AMQP")
    Rel(planning_bus, pln_scheduled, "Deliver schedule event", "AMQP")
    Rel(pln_scheduled, pkg_packed, "Trigger packing", "XML")
    Rel(pkg_packed, wms, "Update WMS", "REST")
    Rel(wms, dlv_delivered, "Confirm delivery", "PSV")
    Rel(dlv_delivered, inv_invoiced, "Trigger invoicing", "JSON")
    Rel(inv_invoiced, erp_finance, "Create invoice", "SOAP / SQL")
    Rel(biztalk_send, payment_gateway, "Process payment", "REST")
    Rel(biztalk_orch, biztalk_tracking, "Write milestones", "SQL")
    Rel(biztalk_send, finance_sql, "Persist invoice payload", "SQL")
    Rel(biztalk_send, file_drop, "Drop outbound file", "FILE")
    Rel(dlv_delivered, carrier_tracking, "Read delivery status", "REST")
    BiRel(biztalk_send, edi_gateway, "Exchange invoice and order documents", "AS2")