> ## Documentation Index
> Fetch the complete documentation index at: https://docs.contazen.ro/llms.txt
> Use this file to discover all available pages before exploring further.

# Release Reservation

> Give up a pending reservation the device no longer plans to use.

## Overview

Flips a `pending` reservation to `released`. Called by the mobile app when the user discards an offline draft before it was synced.

<Warning>
  Releasing does **not** return the number to the pool — the series counter already advanced when the reservation was allocated. Released reservations become documented gaps (same outcome as expired ones). Release primarily exists so the server can tell the difference between "device will retry this invoice later" and "user cancelled it intentionally" — useful for audit trails and for other devices that may come back online and expect accurate pool sizes.
</Warning>

## Path parameters

<ParamField path="token" type="string" required>
  The `reservation_token` returned by [Reserve Numbers](/api-reference/endpoints/invoice-series/reserve-numbers).
</ParamField>

## Response

Returns the updated reservation object with `status = 'released'`.

## Errors

| Code               | Meaning                                                                   |
| ------------------ | ------------------------------------------------------------------------- |
| `resource_missing` | Token does not exist or belongs to another firm.                          |
| `forbidden`        | Token belongs to a different device — only the owning device can release. |


## OpenAPI

````yaml POST /invoice-series/reservations/{token}/release
openapi: 3.1.0
info:
  title: Contazen API
  version: 1.2.0
  description: >
    Build powerful integrations with the Contazen invoicing platform. The
    Contazen API is organized around REST, 

    has predictable resource-oriented URLs, accepts JSON request bodies, returns
    JSON-encoded responses, 

    and uses standard HTTP response codes, authentication, and verbs.


    ## Authentication

    The API uses Bearer token authentication. Include your API key in the
    Authorization header.


    ### Getting your API Key

    1. Log in to your Contazen account

    2. Navigate to Settings > API

    3. Generate or copy your API key (starts with `sk_live_` for production or
    `sk_test_` for testing)


    ### Using the API Key

    Include your API key in the Authorization header:

    ```

    Authorization: Bearer sk_live_YOUR_API_KEY

    ```


    ### Example Request with cURL

    ```bash

    curl --request GET \
      --url https://api.contazen.ro/v1/clients \
      --header 'Authorization: Bearer sk_live_YOUR_API_KEY' \
      --header 'Accept: application/json'
    ```


    ## Rate Limiting

    - 1000 requests per hour per API key

    - 100 create operations per minute per API key


    Rate limit information is included in response headers:

    - `X-RateLimit-Limit`: Maximum requests allowed

    - `X-RateLimit-Remaining`: Requests remaining

    - `X-RateLimit-Reset`: Reset time (Unix timestamp)


    ## Pagination

    All list endpoints return paginated results with the following format:

    ```json

    {
      "success": true,
      "data": {
        "object": "list",
        "data": [...],
        "has_more": true,
        "total": 245,
        "page": 1,
        "per_page": 50,
        "total_pages": 5
      },
      "meta": {
        "version": "v1",
        "request_id": "req_1a2b3c4d",
        "response_time": "23.45ms"
      }
    }

    ```


    ## Multi-Work-Point Access

    API keys belong to a specific work point but can access data from all work
    points

    within the same parent company.


    ## Error Handling

    The API uses conventional HTTP response codes to indicate success or
    failure. 

    In general: 2xx codes indicate success, 4xx codes indicate an error due to
    the 

    information provided, and 5xx codes indicate an error with Contazen's
    servers.


    ## Expanding Nested Objects

    Many endpoints support the `expand` parameter to include related objects in
    the response.

    This follows the Stripe API pattern. For example:

    - `expand[]=lines` - Include invoice line items

    - `expand[]=payments` - Include payment records

    - `expand[]=client` - Include full client object


    ## Localization

    The API supports multiple languages through:

    - `locale` query parameter (en, ro)

    - `Accept-Language` header

    - Default: English
  contact:
    name: Contazen Support
    email: support@contazen.ro
    url: https://contazen.ro
  license:
    name: Proprietary
    url: https://www.contazen.ro/termeni-si-conditii-de-utilizare/
servers:
  - url: https://api.contazen.ro/v1
    description: Production API server
security:
  - bearerAuth: []
tags:
  - name: Authentication
    description: API authentication and test endpoints
  - name: Clients
    description: Manage your customers (B2B and B2C)
  - name: Invoices
    description: Create and manage invoices, proformas, and receipts
  - name: Products
    description: Manage your product and service catalog
  - name: Expenses
    description: Track and manage business expenses
  - name: Expense Categories
    description: Organize expenses with categories
  - name: Suppliers
    description: Manage expense suppliers and vendors
  - name: Settings
    description: API settings and configuration
  - name: Payments
    description: Payments received against invoices
  - name: Receipts
    description: Cash receipts (chitanțe) — standalone or paired with an invoice
  - name: Company Lookup
    description: Romanian company lookup (ANAF / VIES)
  - name: Invoice Series
    description: Manage invoice numbering series
  - name: Bank Accounts
    description: Manage IBAN bank accounts
  - name: E-Factura
    description: Romanian e-invoicing status and configuration
  - name: Supplier Bills
    description: Supplier invoices imported from the ANAF SPV inbox
  - name: VAT Rates
    description: Firm-scoped custom VAT rates on top of the Romanian catalog
  - name: Currencies
    description: Currencies enabled for the firm's bill templates
  - name: Languages
    description: Languages enabled for the firm's bill templates
  - name: Conta
    description: |
      Public ANAF data for the firm's CUI: fiscal profile (TVA scope, RTVAI,
      split TVA, status, e-Factura registration, CAEN) and annual balance
      sheets (cifra de afaceri, profit, capitaluri, datorii, salariați).

      Powered by the public ANAF webservices (no OAuth required for these
      endpoints). The data is cached locally and refreshed on demand via
      the `/sync` actions.
paths:
  /invoice-series/reservations/{token}/release:
    post:
      tags:
        - Invoice Series
      summary: Release an unused reservation
      description: |
        Flip a pending reservation to `released`. The pre-allocated number is
        not returned to the pool — it becomes a documented gap.
      operationId: releaseInvoiceSeriesReservation
      parameters:
        - name: token
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Reservation released
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                  data:
                    $ref: '#/components/schemas/NumberReservation'
                  meta:
                    $ref: '#/components/schemas/ResponseMeta'
        '401':
          $ref: '#/components/responses/UnauthorizedError'
        '403':
          description: Reservation belongs to another device
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          $ref: '#/components/responses/NotFoundError'
components:
  schemas:
    NumberReservation:
      type: object
      description: Pre-allocated invoice number held for a mobile device.
      properties:
        object:
          type: string
          example: number_reservation
        token:
          type: string
          description: Opaque token — pass as `reservation_token` on POST /invoices.
        series_id:
          type: string
          nullable: true
          description: CzUid of the series the reservation belongs to.
        number:
          type: integer
          description: The pre-allocated `number_idx` within the series.
        status:
          type: string
          enum:
            - pending
            - consumed
            - released
            - expired
        device_id:
          type: string
        reserved_at:
          type: integer
          nullable: true
        expires_at:
          type: integer
          nullable: true
        consumed_at:
          type: integer
          nullable: true
        client_local_uuid:
          type: string
          nullable: true
    ResponseMeta:
      type: object
      properties:
        version:
          type: string
          default: v1
        request_id:
          type: string
          format: uuid
          description: Unique request identifier for debugging
        response_time:
          type: string
          example: 23.45ms
    ErrorResponse:
      type: object
      required:
        - success
        - error
      properties:
        success:
          type: boolean
          default: false
        error:
          type: object
          required:
            - message
            - type
            - code
          properties:
            message:
              type: string
              description: Human-readable error message
            type:
              type: string
              enum:
                - api_error
                - authentication_error
                - invalid_request_error
                - rate_limit_error
                - permission_error
                - validation_error
            code:
              type: string
              description: Machine-readable error code
            param:
              type: string
              description: The parameter that caused the error
            doc_url:
              type: string
              format: uri
              description: URL to relevant documentation
        meta:
          $ref: '#/components/schemas/ResponseMeta'
  responses:
    UnauthorizedError:
      description: API key is missing or invalid
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    NotFoundError:
      description: The specified resource was not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Use your API key (sk_live_xxx or sk_test_xxx)

````