# Proration Preview Amount Check

Check proration previews against the price change and time remaining.

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

## Inputs
The subscription, the old and new prices and the days left in the cycle.

## Workflow
1. Record old and new prices.
2. Record the days left in the cycle.
3. Recompute the expected proration.
4. Return the check without changing the subscription.

## Output contract
subscription | old_price | new_price | days_left | prorated

## Fictional acceptance test
Fictional upgrade from 20 to 50 with 15 of 30 days left: expected proration difference of 15.00.

## 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/prorations

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