Subscription plan upgrade workflow with feature comparison, proration calculation, immediate feature unlock, and billing adjustment.

Full FlowZap Code

Customer { # Customer
  n1: circle label:"Start"
  n2: rectangle label:"Select new plan tier"
  n3: rectangle label:"Review price difference"
  n4: rectangle label:"Enter payment details"
  n5: rectangle label:"Receive upgrade confirmation"
  n6: circle label:"End"

  n1.handle(right) -> n2.handle(left)
  n2.handle(bottom) -> PricingEngine.n7.handle(top) [label="Calculate"]
  n3.handle(right) -> n4.handle(left)
  n4.handle(bottom) -> Billing.n12.handle(top) [label="Process payment"]
  n5.handle(right) -> n6.handle(left)
}

PricingEngine { # Pricing Engine
  n7: rectangle label:"Fetch current subscription"
  n8: rectangle label:"Calculate prorated amount"
  n9: diamond label:"Credit balance available?"
  n10: rectangle label:"Apply credit to upgrade"
  n11: rectangle label:"Show full price"

  n7.handle(right) -> n8.handle(left)
  n8.handle(right) -> n9.handle(left)
  n9.handle(right) -> n10.handle(left) [label="Yes"]
  n9.handle(bottom) -> n11.handle(top) [label="No"]
  n10.handle(top) -> Customer.n3.handle(bottom) [label="Price ready"]
  n11.handle(top) -> Customer.n3.handle(bottom) [label="Price ready"]
}

Billing { # Billing System
  n12: rectangle label:"Validate payment method"
  n13: diamond label:"Payment valid?"
  n14: rectangle label:"Charge prorated amount"
  n15: rectangle label:"Return payment error"
  n16: diamond label:"Charge successful?"
  n17: rectangle label:"Update subscription tier"
  n18: rectangle label:"Log failed charge"

  n12.handle(right) -> n13.handle(left)
  n13.handle(right) -> n14.handle(left) [label="Yes"]
  n13.handle(bottom) -> n15.handle(top) [label="No"]
  n14.handle(right) -> n16.handle(left)
  n15.handle(top) -> Customer.n4.handle(bottom) [label="Try again"]
  n16.handle(right) -> n17.handle(left) [label="Yes"]
  n16.handle(bottom) -> n18.handle(top) [label="No"]
  n17.handle(bottom) -> Provisioning.n19.handle(top) [label="Activate"]
  n18.handle(top) -> Customer.n4.handle(bottom) [label="Retry"]
}

Provisioning { # Feature Provisioning
  n19: rectangle label:"Enable premium features"
  n20: rectangle label:"Update usage limits"
  n21: rectangle label:"Send upgrade email"

  n19.handle(right) -> n20.handle(left)
  n20.handle(right) -> n21.handle(left)
  n21.handle(top) -> Customer.n5.handle(bottom) [label="Complete"]
}

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