> ## Documentation Index > Fetch the complete documentation index at: https://docs.nozle.dev/llms.txt > Use this file to discover all available pages before exploring further. # A paid plan change needs review > A paid plan change cannot be applied and its intent goes to review. The payment is refunded. Sent once per intent, even when two payments of the same checkout are reviewed at the same moment. ## OpenAPI ````yaml /nozle-openapi.yaml webhook plan_upgrade_intent_needs_review openapi: 3.1.0 info: title: Nozle API description: >- One specification for the Nozle API. Core operations use the default server https://api.nozle.app/core/api/v1. Engine operations name their own server, https://api.nozle.app/engine/api/v1. Both live on the one host https://api.nozle.app. **Legacy key names, removed after January 19, 2027.** Until January 19, 2027 (inclusive), REST responses and webhook payloads carry the old key beside the new one, with the same value, on every object that had it before. `lago_id` is the old name of `nozle_id`. These old names are the new keys with the former prefix: `lago_add_on_id`, `lago_alert_id`, `lago_charge_filter_id`, `lago_charge_id`, `lago_coupon_id`, `lago_credit_note_id`, `lago_customer_id`, `lago_feature_id`, `lago_fee_id`, `lago_fixed_charge_id`, `lago_integration_id`, `lago_invoice_id`, `lago_invoice_ids`, `lago_item_id`, `lago_order_form_id`, `lago_organization_id`, `lago_original_fee_id`, `lago_parent_id`, `lago_payable_id`, `lago_payment_provider_id`, `lago_payment_request_id`, `lago_plan_id`, `lago_pricing_unit_id`, `lago_quote_id`, `lago_quote_version_id`, `lago_subscription_id`, `lago_tax_id`, `lago_true_up_fee_id`, `lago_true_up_parent_fee_id`, `lago_user_id`, `lago_voided_invoice_id`, `lago_wallet_id`, `lago_wallet_transaction_id`. A key gets its old name only on the objects where it was renamed. Old EU tax codes (`lago_eu_`) resolve to `nozle_eu_` in `tax_codes` inputs and in `GET`, `PUT` and `DELETE /taxes/{code}`. CSV exports (invoices, invoice fees, credit notes, credit note items) repeat the id columns at the end under the old names `lago_id`, `customer_lago_id`, `invoice_lago_id`, `fee_lago_id`, `credit_note_lago_id`, `credit_note_item_lago_id` and `credit_note_item_fee_lago_id`. Read the new names before the removal date. version: 1.49.0 license: name: AGPLv3 url: https://github.com/nozle-dev/core/blob/main/LICENSE contact: email: support@nozle.app servers: - url: https://api.nozle.app/core/api/v1 description: Nozle Billing API security: - bearerAuth: [] tags: - name: Activity Logs description: Everything about Activity logs externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Analytics description: Everything about Analytics - name: API Logs description: Everything about API logs externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Features description: Everything about Feature collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Entitlements description: Everything about Entitlement collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Billing Entities description: Everything about Billing Entities externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Customers description: Everything about Customer collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Plans description: Everything about Plan collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Subscriptions description: Everything about Subscription collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Events description: Everything about Event collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Cost Events description: Detailed internal cost usage linked to Feature Events or customers - name: Shared Costs description: Preview and finalize allocated period costs - name: Cost Intelligence description: Ledger-backed cost analytics and profitability inputs - name: Cost Intelligence Operations description: >- Operator replay tools for recoverable cost-processing failures. These routes accept only Nozle's internal service token; organization secret and publishable keys get `403`. - name: Organizations description: Everything about Organization collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Taxes description: Everything about Tax collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Coupons description: Everything about Coupon collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Add-ons description: Everything about Add-on collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Fees description: Everything about Fees externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Invoices description: Everything about Invoice collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Wallets description: Everything about Wallet collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Credit Notes description: Everything about Credit notes collection externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Webhooks description: Everything about Webhooks externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Webhook Endpoints description: Everything about Webhook Endpoints externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Payment Receipts description: Everything about Payment receipts externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Payment Requests description: Everything about PaymentRequests externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Payments description: Everything about Payments externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Payment Methods description: Everything about Payment Methods externalDocs: description: Find out more url: https://docs.nozle.dev/api-reference - name: Billing Imports description: Billing Imports operations - name: Billing Status description: Billing Status operations - name: Checkout description: Checkout operations - name: Cost Models description: Cost Models operations - name: Credit Imports description: Credit Imports operations - name: Credits description: Credits operations - name: Entities description: Entities operations - name: Entity Subscriptions description: Entity Subscriptions operations - name: Health description: Health operations - name: LLM Proxy description: LLM Proxy operations - name: Margin description: Margin operations - name: Subscription Changes description: Subscription Changes operations - name: Usage description: Usage operations externalDocs: description: Nozle Github url: https://github.com/nozle-dev paths: {} components: securitySchemes: bearerAuth: type: http scheme: bearer ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.