---
title: "Preview Change Subscription Plan"
method: POST
path: "/billing/subscription/change-plan/preview"
tags: ["billing"]
---

# Preview Change Subscription Plan

`POST /billing/subscription/change-plan/preview`

## Request

- Base URL: `https://api.threadchain.pro` (the document declares no server; this is the origin it was published from)
- URL: `https://api.threadchain.pro/billing/subscription/change-plan/preview`
- Auth: OAuth 2
  - Password
  - Token URL: `auth/token`

Preview the proration Stripe would charge for an immediate upgrade.

## Request body

- ChangeSubscriptionPlanRequest: Request to move an existing subscription to a different plan
  - `new_payment_plan_id` string, uuid, required
  - `prorate` boolean

## Response `200`

Successful Response

- ChangeSubscriptionPlanPreviewResponse: Preview of the proration Stripe would charge for a plan change
  - `currency` string, required
  - `current_plan_id` string, uuid, required
  - `current_plan_name` string, required
  - `new_plan_id` string, uuid, required
  - `new_plan_name` string, required
  - `credit_amount` integer, required
  - `charge_amount` integer, required
  - `amount_due_now` integer, required
  - `amount_due_now_display` string, required
  - `days_left` integer
  - `days_in_period` integer
  - `next_billing_date` string, date-time, required
  - `next_billing_amount` integer, required
  - `next_billing_amount_display` string, required
  - `card_brand` string, nullable
  - `card_last4` string, nullable
  - `scheduled` boolean
  - `seats` integer

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/threadchain/apis/threadchain-backend.md) - [All operations](https://skmtc.dev/threadchain/apis/threadchain-backend/llms.txt) - [OpenAPI document](https://skmtc.dev/threadchain/apis/threadchain-backend/revisions/8ee288a7e6bd?raw)