# Subscription Schedule Phase Transition Check

Check a subscription schedule’s phase transition against the phase configuration and dates.

## Scope
Preparation and review only. No account action or professional decision.

## Inputs
Each phase’s items, price and duration, and the recorded next phase start.

## Workflow
1. Record each phase’s items, price and duration.
2. Compute the expected transition date.
3. Compare to the recorded next phase start.
4. Return the check without subscription changes.

## Output contract
schedule | phase | start_date | duration_months | expected_next_start | recorded_next_start | match

## Fictional acceptance test
Fictional schedule starts phase one on January 1 for 3 months, an expected transition on April 1; the schedule records April 15, a 14-day drift that would bill the old price for two extra weeks.

## Review gates
Keep original values, source IDs and version dates. Unknown facts stay held. Use qualified review for hiring, legal and accounting conclusions. No send, share, sign-in, scheduling, ledger change or payment. Fictional contract review is not a live account compatibility test.

## Method source
https://docs.stripe.com/billing/subscriptions/subscription-schedules

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