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

# Create checkbook

> Creates an `ACTIVE` checkbook for one of the business's banks; `current_number` starts at `start_number`.

**Required permission:** `treasury.write`



## OpenAPI

````yaml /api-reference/openapi.en.json post /treasury/checkbooks
openapi: 3.0.3
info:
  title: FileXpress External API
  version: 1.0.0
  description: >-
    API for integrating third-party systems with FileXpress: billing, HR,
    accounting, inventory, projects, accounts receivable and payable, treasury,
    pricing and promotions, and cash. Current base URL: /api/external/v1. The
    legacy unversioned path (/api/external) will be removed on January 1, 2027;
    migrate to /api/external/v1 (same endpoints, only the base URL changes). The
    v2 API (/api/external/v2) exposes currencies and exchange rates, sales and
    purchases in foreign currency, taxes by id, payrolls with branch, and errors
    with a stable `code`; its operations carry the /v2 prefix in the path. We
    suggest migrating to the available v2 routes before March 30, 2027.
servers:
  - url: https://api.filexpress.app/api/external/v1
    description: Production
security:
  - ApiKey: []
tags:
  - name: General
  - name: Billing · Sales
  - name: Billing · Purchases
  - name: Billing · Customers
  - name: Billing · Suppliers
  - name: Billing · Products
  - name: Catalogs
  - name: HR · Employees
  - name: HR · Attendance
  - name: HR · Labor rules
  - name: HR · Schedules
  - name: HR · Holidays
  - name: HR · Attendance results
  - name: HR · Leave requests
  - name: HR · Payrolls
  - name: Accounting
  - name: Inventory
  - name: Projects
  - name: Accounts receivable
  - name: Accounts payable
  - name: Treasury
  - name: Pricing and promotions
  - name: Cash
  - name: Points of sale
  - name: API v2 · General
  - name: API v2 · Currencies and rates
  - name: API v2 · Countries
  - name: API v2 · Sales
  - name: API v2 · Purchases
  - name: API v2 · Payrolls
paths:
  /treasury/checkbooks:
    post:
      tags:
        - Treasury
      summary: Create checkbook
      description: >-
        Creates an `ACTIVE` checkbook for one of the business's banks;
        `current_number` starts at `start_number`.


        **Required permission:** `treasury.write`
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CheckbookRequest'
            example:
              bank_id: 3b8e2f10-7c4d-4a9e-b1f2-5d6c7e8f9a01
              name: Chequera 2027
              code: B
              start_number: 101
              end_number: 200
      responses:
        '201':
          description: Checkbook created
          content:
            application/json:
              schema:
                type: object
                required:
                  - status
                  - data
                properties:
                  status:
                    type: boolean
                    example: true
                  data:
                    $ref: '#/components/schemas/Checkbook'
              example:
                status: true
                data:
                  id: 9d1c5a3e-4b7f-4e2a-9c1d-2f6b8a0e7c11
                  bank_id: 3b8e2f10-7c4d-4a9e-b1f2-5d6c7e8f9a01
                  name: Chequera 2027
                  code: B
                  start_number: 101
                  end_number: 200
                  current_number: 101
                  status: ACTIVE
        '401':
          $ref: '#/components/responses/E401'
        '403':
          $ref: '#/components/responses/E403'
        '404':
          description: Not found or belongs to another business
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
              example:
                status: false
                message: Bank not found
        '422':
          description: Validation error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
              example:
                status: false
                message: Validation errors
                errors:
                  end_number:
                    - The end number field must be greater than start number.
        '429':
          $ref: '#/components/responses/E429'
components:
  schemas:
    CheckbookRequest:
      type: object
      properties:
        bank_id:
          type: string
          format: uuid
          description: Bank of the business.
        start_number:
          type: integer
          minimum: 1
        end_number:
          type: integer
          description: Greater than start_number.
        name:
          type: string
          maxLength: 100
        code:
          type: string
          maxLength: 50
      required:
        - bank_id
        - start_number
        - end_number
    Checkbook:
      type: object
      properties:
        id:
          type: string
          format: uuid
        bank_id:
          type: string
          format: uuid
        name:
          type: string
        code:
          type: string
          nullable: true
        start_number:
          type: integer
        end_number:
          type: integer
        current_number:
          type: integer
        status:
          type: string
          description: Status.
          enum:
            - ACTIVE
            - EXHAUSTED
            - CANCELLED
      required:
        - id
        - name
        - status
    Error:
      type: object
      properties:
        status:
          type: boolean
          example: false
        message:
          type: string
        errors:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: Errors per field (validation only).
      required:
        - status
        - message
  responses:
    E401:
      description: Missing or invalid API Key
      content:
        application/json:
          example:
            status: false
            message: Invalid API Key.
    E403:
      description: Integration without the required permission or deactivated
      content:
        application/json:
          example:
            status: false
            message: This integration does not have the 'hr.employees' permission.
            required_scope: hr.employees
    E429:
      description: Rate limit exceeded
      content:
        application/json:
          example:
            status: false
            message: Rate limit exceeded. Please try again later.
            rate_limit: 100
  securitySchemes:
    ApiKey:
      type: apiKey
      in: header
      name: X-API-Key
      description: Integration API Key (Integrations → New Integration).

````

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