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System Context (Mermaid C4)

A C4 context diagram for a payments platform.

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C4Context
  title System Context - Payments Platform
  Person(customer, "Customer", "Makes payments")
  System(payments, "Payments Platform", "Processes transactions")
  System_Ext(bank, "Bank", "Settles funds")
  System_Ext(email, "Email", "Notifications")
  Rel(customer, payments, "Uses")
  Rel(payments, bank, "Settles via")
  Rel(payments, email, "Sends receipts via")