> ## Documentation Index > Fetch the complete documentation index at: https://docs.horizonpay.co/llms.txt > Use this file to discover all available pages before exploring further. # Update a price > Updates the fields you send and leaves the rest unchanged. A price cannot move to another product (`422`) — create a new price instead. Finalized invoices keep the amount they were billed at; a draft picks up the change the next time it is saved. **Scope:** `products:write` ## OpenAPI ````yaml /openapi.json patch /prices/{id} openapi: 3.1.0 info: title: Invoice-AI API version: 1.0.0 description: >- Stripe-shaped invoicing over HTTP: customers, products, prices, invoices and invoice items, with `cus_…`, `prod_…`, `price_…`, `in_…` and `ii_…` ids. - **Auth:** `Authorization: Bearer inv_live_…`, with per-key scopes. - **Envelope:** JSON bodies; responses wrap the resource in `{ "data": … }`; lists add `next_cursor`. - **Money:** integer minor units of the currency everywhere (`250000` is $2,500.00; ¥5,000 is `5000`). - **Errors:** RFC 9457 `application/problem+json` — branch on `code`. - **Idempotency:** operations that spend an invoice number, email or record payment require an `Idempotency-Key`. - **Rate limits:** 120 requests/minute per key. Sending email: 10/hour per key and 50/hour per account. See the `RateLimit-*` headers. contact: name: Invoice-AI support url: https://invoice.horizonpay.co servers: - url: https://invoice.horizonpay.co/api/v1 description: Production security: - apiKey: [] tags: - name: Business x-displayName: Business description: >- Your business profile — the issuer printed on every invoice. Read-only over the API; edit it in Settings. - name: Customers x-displayName: Customers description: >- The people and companies you bill. Every invoice references a customer by `cus_…` id. Customers are archived rather than deleted, so issued invoices keep naming who they were billed to. - name: Products x-displayName: Products description: >- The things you sell. A product carries a name and description; amounts live on its prices. Archiving sets `active: false` and keeps history intact. - name: Prices x-displayName: Prices description: >- Ways to charge for a product: an amount in integer minor units and a currency, one-time or recurring. Bill a price on an invoice line with `price: "price_…"`. - name: Invoices x-displayName: Invoices description: >- Invoices move `draft` → `open` (finalize assigns a permanent, consecutive number) → `paid`, or `open` → `void`. Drafts are freely editable and deletable; finalized invoices are frozen. `overdue` is an open invoice past its due date, derived at read time. Operations that spend a number, send email or record payment require an `Idempotency-Key`. - name: Invoice items x-displayName: Invoice items description: >- Individual lines of an invoice. Add or remove lines on a draft one at a time; totals are recomputed server-side and the whole invoice is returned. - name: Webhook endpoints x-displayName: Webhook endpoints description: >- Register https endpoints to receive invoice events (`invoice.created`, `invoice.finalized`, `invoice.paid`, …). Deliveries are signed per [Standard Webhooks](https://www.standardwebhooks.com/) with `webhook-id`, `webhook-timestamp` and `webhook-signature` headers (HMAC-SHA256 over `{id}.{timestamp}.{body}`); failed deliveries are retried with backoff. paths: /prices/{id}: patch: tags: - Prices summary: Update a price description: >- Updates the fields you send and leaves the rest unchanged. A price cannot move to another product (`422`) — create a new price instead. Finalized invoices keep the amount they were billed at; a draft picks up the change the next time it is saved. **Scope:** `products:write` operationId: updatePrice parameters: - in: path name: id schema: type: string description: The price, `price_…` or UUID. examples: - price_Jc5Tn8Wq1Ze6Ra3Ym9Ub2Gs7 required: true description: The price, `price_…` or UUID. requestBody: required: true content: application/json: example: nickname: Monthly (annual contract) type: recurring recurring: interval: month interval_count: 1 schema: $ref: '#/components/schemas/PriceUpdate' responses: '200': description: The updated price. headers: X-Request-Id: $ref: '#/components/headers/RequestId' RateLimit-Limit: $ref: '#/components/headers/RateLimitLimit' RateLimit-Remaining: $ref: '#/components/headers/RateLimitRemaining' RateLimit-Reset: $ref: '#/components/headers/RateLimitReset' content: application/json: example: data: id: price_Jc5Tn8Wq1Ze6Ra3Ym9Ub2Gs7 object: price product: prod_Hy7Rq2Lm9Xc4Vb8Nt3Kd6Pw1 nickname: Monthly (annual contract) unit_amount: 2500000 currency: USD billing_scheme: per_unit type: recurring recurring: interval: month interval_count: 1 tax_rate: 0 active: true created: '2026-09-22T09:30:00.000Z' schema: type: object properties: data: $ref: '#/components/schemas/Price' description: The updated price. required: - data additionalProperties: false '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '404': description: >- No such price. Another account's resource is also a `404`, so ids cannot be probed. Codes: `not_found`. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' examples: not_found: summary: Price not found. value: type: https://invoice.horizonpay.co/problems/not-found title: Not found status: 404 detail: Price not found. instance: req_7f3c9a1e2b4d4e8a9c6f2d1b0a3e5f71 code: not_found '422': description: >- The body failed validation, or tried to move the price to another product. Codes: `validation`. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' examples: validation: summary: A price cannot move to another product. value: type: https://invoice.horizonpay.co/problems/validation title: Validation failed status: 422 detail: A price cannot move to another product. instance: req_7f3c9a1e2b4d4e8a9c6f2d1b0a3e5f71 code: validation errors: - path: product message: Create a new price on the other product instead. '429': $ref: '#/components/responses/RateLimited' x-codeSamples: - lang: bash label: cURL source: >- curl -X PATCH https://invoice.horizonpay.co/api/v1/prices/price_Jc5Tn8Wq1Ze6Ra3Ym9Ub2Gs7 \ -H "Authorization: Bearer $INVOICE_AI_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "nickname": "Monthly (annual contract)", "type": "recurring", "recurring": { "interval": "month", "interval_count": 1 } }' - lang: node label: Node.js source: >- import InvoiceAI from '@horizonpay/invoice-ai' const invoiceai = new InvoiceAI() // reads INVOICE_AI_API_KEY const price = await invoiceai.prices.update('price_Jc5Tn8Wq1Ze6Ra3Ym9Ub2Gs7', { nickname: 'Monthly (annual contract)', type: 'recurring', recurring: { interval: 'month', interval_count: 1 }, }) console.log(price.nickname) - lang: python label: Python source: |- from invoice_ai import InvoiceAI client = InvoiceAI() # reads INVOICE_AI_API_KEY price = client.prices.update( "price_Jc5Tn8Wq1Ze6Ra3Ym9Ub2Gs7", nickname="Monthly (annual contract)", type="recurring", recurring={"interval": "month", "interval_count": 1}, ) print(price.nickname) components: schemas: PriceUpdate: type: object properties: product: description: >- Not updatable — sending it is a `422`. Create a new price on the other product instead. type: string minLength: 1 nickname: description: Internal label. `null` or `""` clears it. anyOf: - type: string - type: 'null' unit_amount: type: integer minimum: 0 maximum: 9007199254740991 description: Price per unit in integer minor units (`2500000` is $25,000.00). examples: - 2500000 currency: type: string minLength: 3 maxLength: 3 pattern: ^[A-Z]{3}$ description: >- ISO 4217 code, three letters (uppercased for you). Must match the invoice currency when billed. examples: - USD type: description: >- Switching to `one_time` clears the interval; switching to `recurring` needs `recurring.interval` unless one is stored. examples: - recurring type: string enum: - one_time - recurring recurring: description: Required when `type` is `recurring`; must be omitted for `one_time`. type: object properties: interval: type: string enum: - day - week - month - year description: 'Billing interval: `day`, `week`, `month`, `year`.' examples: - month interval_count: default: 1 description: Intervals between bills, 1–52. Defaults to 1. examples: - 1 type: integer minimum: 1 maximum: 52 required: - interval tax_rate: description: >- Default tax percentage, 0–100, for lines billed from this price. Defaults to 0. examples: - 0 type: number minimum: 0 maximum: 100 active: description: '`false` archives, `true` restores.' examples: - true type: boolean description: Any subset of fields. Omitted fields are left unchanged. Price: type: object properties: id: type: string description: Unique identifier, `price_…`. examples: - price_Jc5Tn8Wq1Ze6Ra3Ym9Ub2Gs7 object: type: string const: price description: Always `price`. product: anyOf: - type: string - type: 'null' description: The parent product, `prod_…`. Cannot change after creation. examples: - prod_Hy7Rq2Lm9Xc4Vb8Nt3Kd6Pw1 nickname: anyOf: - type: string - type: 'null' description: Internal label, e.g. "Monthly". examples: - Monthly unit_amount: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: >- Price per unit. Integer minor units of the currency (`250000` is $2,500.00; ¥5,000 is `5000`). examples: - 2500000 currency: type: string description: ISO 4217 currency code, uppercase. examples: - USD billing_scheme: type: string const: per_unit description: Always `per_unit`. type: type: string enum: - one_time - recurring description: '`recurring` prices carry `recurring`; nothing auto-bills them yet.' recurring: anyOf: - type: object properties: interval: anyOf: - type: string - type: 'null' description: '`day`, `week`, `month` or `year`.' examples: - month interval_count: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: Number of intervals between bills (1–52). examples: - 1 required: - interval - interval_count additionalProperties: false - type: 'null' description: Billing cadence. `null` on one-time prices. tax_rate: type: number description: Default tax percentage (0–100) for lines billed from this price. examples: - 0 active: type: boolean description: >- `false` once archived. Archived prices cannot be chosen for new lines in the app. created: type: string description: When the price was created (ISO 8601). format: date-time required: - id - object - product - nickname - unit_amount - currency - billing_scheme - type - recurring - tax_rate - active - created additionalProperties: false description: >- One way to charge for a product: an amount in a currency, one-time or recurring. Problem: type: object properties: type: type: string description: >- A URI identifying the problem type: `https://invoice.horizonpay.co/problems/` with underscores as hyphens. examples: - https://invoice.horizonpay.co/problems/invalid-state title: type: string description: Short, human-readable summary of the problem type. examples: - Invalid state for this operation status: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: The HTTP status code, repeated for convenience. examples: - 409 detail: type: string description: >- Human-readable explanation of this occurrence. Wording may change — do not parse it. examples: - This invoice has been finalized and can no longer be edited. instance: type: string description: >- The request id (also sent as `X-Request-Id`), for correlating with our logs. examples: - req_7f3c9a1e2b4d4e8a9c6f2d1b0a3e5f71 code: type: string description: >- Stable machine-readable code. Branch on this, never on `detail`. One of: `validation`, `idempotency_mismatch`, `unauthorized`, `forbidden`, `not_found`, `invalid_state`, `conflict`, `idempotency_key_required`, `rate_limited`, `upstream_failed`, `internal_error`. examples: - invalid_state errors: description: Field-level problems. Present on `validation` errors only. type: array items: type: object properties: path: type: string description: Dot-path of the offending field, e.g. `items.0.unit_amount`. examples: - email message: type: string description: What is wrong with it. examples: - Enter a valid email required: - path - message additionalProperties: false required: - type - title - status - detail - instance - code additionalProperties: false description: >- An RFC 9457 problem details object, served as `application/problem+json`. Every non-2xx response uses this shape. headers: RequestId: required: true description: >- The request id: yours, if you sent `X-Request-Id` (up to 200 characters), otherwise one we generated. Quote it to support. schema: type: string description: >- The request id: yours, if you sent `X-Request-Id` (up to 200 characters), otherwise one we generated. Quote it to support. examples: - req_7f3c9a1e2b4d4e8a9c6f2d1b0a3e5f71 RateLimitLimit: required: true description: Requests allowed in the current window for this key and bucket. schema: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: Requests allowed in the current window for this key and bucket. examples: - 120 RateLimitRemaining: required: true description: Requests left in the current window. schema: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: Requests left in the current window. examples: - 119 RateLimitReset: required: true description: Unix time (seconds) at which the window resets. schema: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: Unix time (seconds) at which the window resets. examples: - 1789371294 RetryAfter: required: true description: Seconds to wait before retrying. schema: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: Seconds to wait before retrying. examples: - 42 responses: Unauthorized: description: >- The API key is missing, malformed, unknown, revoked or expired. The response carries `WWW-Authenticate: Bearer`. Codes: `unauthorized`. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' examples: unauthorized: summary: 'Send your API key as `Authorization: Bearer inv_live_…`.' value: type: https://invoice.horizonpay.co/problems/unauthorized title: Unauthorized status: 401 detail: 'Send your API key as `Authorization: Bearer inv_live_…`.' instance: req_7f3c9a1e2b4d4e8a9c6f2d1b0a3e5f71 code: unauthorized Forbidden: description: >- The key is valid but lacks a scope this operation needs (see `x-required-scope`). Codes: `forbidden`. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' examples: forbidden: summary: This credential is missing the invoices:write scope. value: type: https://invoice.horizonpay.co/problems/forbidden title: Insufficient scope status: 403 detail: This credential is missing the invoices:write scope. instance: req_7f3c9a1e2b4d4e8a9c6f2d1b0a3e5f71 code: forbidden RateLimited: description: >- Rate limit exceeded for this API key. Wait the number of seconds in `Retry-After` before retrying. Codes: `rate_limited`. headers: Retry-After: $ref: '#/components/headers/RetryAfter' X-Request-Id: $ref: '#/components/headers/RequestId' content: application/problem+json: schema: $ref: '#/components/schemas/Problem' examples: rate_limited: summary: Rate limit of 120 per 60s exceeded. value: type: https://invoice.horizonpay.co/problems/rate-limited title: Too many requests status: 429 detail: Rate limit of 120 per 60s exceeded. instance: req_7f3c9a1e2b4d4e8a9c6f2d1b0a3e5f71 code: rate_limited securitySchemes: apiKey: type: http scheme: bearer bearerFormat: inv_live__ description: >- An Invoice-AI API key sent as `Authorization: Bearer inv_live_…`. Create keys in **Settings → API keys**; the secret is shown once. Each key carries scopes, and every operation lists the scope it needs (`x-required-scope`): - `business:read` — Read your business profile, tax ID and bank details - `clients:read` — List and read your clients - `clients:write` — Create, update and archive clients - `products:read` — List and read products and prices - `products:write` — Create, update and archive products and prices - `invoices:read` — List and read invoices, including PDFs - `invoices:write` — Create, edit and delete drafts - `invoices:finalize` — Finalize invoices and void them - `invoices:send` — Email invoices to your clients - `payments:write` — Mark invoices as paid - `webhooks:manage` — Manage webhook endpoints Keys cannot be created or revoked through the API, so a leaked key cannot mint more keys. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.