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

# Download the CNAB 750 retorno

> Downloads the batch's retorno file: the CNAB 750 receipt of what the rail did with each record of the remessa. It is served byte for byte as it was generated, never re-rendered, because a retorno already downloaded is the client's only proof. 404 when the batch does not exist; 409 while the batch has not produced a retorno.



## OpenAPI

````yaml /pt/openapi/v3-current/spi-brcode.yaml get /api/v1/brcode/arquivos/{id}/retorno
openapi: 3.1.0
info:
  contact:
    email: contact@lerian.studio
    name: Lerian Studio
    url: https://lerian.studio
  description: BR Code service for QR code generation and decoding (EMV QRCPS-MPM).
  license:
    name: Lerian Studio General License
  title: Lerian SPI — BR Code API
  version: 1.0.0
servers:
  - url: https://spi.sandbox.lerian.net
security: []
tags:
  - description: EMV BR Code payload generation, decoding, validation, info, and lookup.
    name: BRCode
  - description: >-
      Pix charges (Cob/CobV/LoteCobV): create, retrieve by TxID, list, cancel,
      reconcile, and resolve public payloads.
    name: Charges
  - description: >-
      Flow (mandatory order): create cob/cobv → generate QR/payload. A dynamic
      BR Code payload references a charge, so the cob/cobv charge MUST be
      created first; the payload links to it by txid/locator.
    name: charge
paths:
  /api/v1/brcode/arquivos/{id}/retorno:
    get:
      tags:
        - Charges
      summary: Download the CNAB 750 retorno
      description: >-
        Downloads the batch's retorno file: the CNAB 750 receipt of what the
        rail did with each record of the remessa. It is served byte for byte as
        it was generated, never re-rendered, because a retorno already
        downloaded is the client's only proof. 404 when the batch does not
        exist; 409 while the batch has not produced a retorno.
      operationId: downloadFileBatchRetorno
      parameters:
        - description: Identificador do lote (UUID) devolvido pelo upload.
          in: path
          name: id
          required: true
          schema:
            description: Identificador do lote (UUID) devolvido pelo upload.
            format: uuid
            type: string
      responses:
        '200':
          content:
            text/plain: {}
          description: Arquivo retorno CNAB 750 (texto plano, 750 posições por linha).
          headers:
            Content-Disposition:
              schema:
                type: string
            Content-Type:
              schema:
                type: string
        '404':
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Detail'
          description: Not Found
        '409':
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Detail'
          description: Conflict
        '422':
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Detail'
          description: Unprocessable Entity
        '500':
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Detail'
          description: Internal Server Error
        default:
          content:
            application/problem+json:
              schema:
                $ref: '#/components/schemas/Detail'
          description: Error
      security:
        - BearerAuth: []
components:
  schemas:
    Detail:
      additionalProperties: false
      properties:
        code:
          description: >-
            Stable, machine-readable domain error code scoped to the emitting
            service (format: <SERVICE>-NNNN).
          type: string
        correlationId:
          description: Request-scoped correlation identifier echoing X-Request-ID.
          examples:
            - req-7a3f9c2e
          type: string
        detail:
          description: >-
            A human-readable explanation specific to this occurrence of the
            problem.
          examples:
            - Property foo is required but is missing.
          type: string
        errors:
          description: Optional list of individual error details
          items:
            $ref: '#/components/schemas/ErrorDetail'
          type:
            - array
            - 'null'
        instance:
          description: >-
            A URI reference that identifies the specific occurrence of the
            problem.
          examples:
            - https://example.com/error-log/abc123
          format: uri
          type: string
        status:
          description: HTTP status code
          examples:
            - 400
          format: int64
          type: integer
        title:
          description: >-
            A short, human-readable summary of the problem type. This value
            should not change between occurrences of the error.
          examples:
            - Bad Request
          type: string
        type:
          default: about:blank
          description: A URI reference to human-readable documentation for the error.
          examples:
            - https://example.com/errors/example
          format: uri
          type: string
        upstream:
          $ref: '#/components/schemas/Upstream'
          description: >-
            RFC 9457 extension member: the error a proxied third-party provider
            reported. Absent unless the emitting service explicitly surfaced
            one.
      required:
        - correlationId
      type: object
    ErrorDetail:
      additionalProperties: false
      properties:
        location:
          description: >-
            Where the error occurred, e.g. 'body.items[3].tags' or
            'path.thing-id'
          type: string
        message:
          description: Error message text
          type: string
        value:
          description: The value at the given location
      type: object
    Upstream:
      additionalProperties: false
      properties:
        code:
          description: The upstream provider's own error code, verbatim.
          examples:
            - E4001
          type: string
        message:
          description: >-
            The upstream provider's own error message, verbatim (bounded, never
            its raw response body).
          examples:
            - account not found at provider
          type: string
      type: object
  securitySchemes:
    BearerAuth:
      bearerFormat: JWT
      description: JWT bearer token issued by the identity provider.
      scheme: bearer
      type: http

````