> ## Documentation Index > Fetch the complete documentation index at: https://docs.maesn.com/llms.txt > Use this file to discover all available pages before exploring further. # Get invoice document ## Field support per integration Please note that the content in output is base64-encoded. }> Supported Response Fields: }> Supported Response Fields: }> Please note that the content in output is the url to download the document. Supported Response Fields: }> If you're not using the [Interactive Authentication Flow](/authentication#interactive-authentication-flow), make sure the query parameters `environmentName` and `companyId` are correctly populated. You can obtain these values by using the `GET Companies` endpoint available under the Authentication section. Please use the id field as the companyId and the environmentId field as the environmentName. Supported Response Fields: }> Supported Response Fields: }> Supported Response Fields: }> Supported Response Fields: }> Supported Response Fields: ## OpenAPI ````yaml get /accounting/invoices/{invoiceId}/document openapi: 3.0.0 info: title: Maesn unified API description: The Maesn unified API description version: '1.0' contact: {} servers: - url: https://api.maesn.dev security: [] tags: - name: maesn description: '' paths: /accounting/invoices/{invoiceId}/document: get: tags: - accounting operationId: getInvoiceDocument parameters: - name: invoiceId required: true in: path schema: type: string - name: X-API-KEY description: API key in: header schema: type: string required: true - name: X-ACCOUNT-KEY description: Account key in: header schema: type: string required: true - name: companyId required: false in: query schema: type: string responses: '200': description: '' content: application/json: schema: allOf: - $ref: '#/components/schemas/BaseResponseDto' - properties: data: $ref: '#/components/schemas/DocumentResponseDto' type: object components: schemas: BaseResponseDto: type: object properties: meta: $ref: '#/components/schemas/MetaResponse' data: oneOf: - type: object - type: array DocumentResponseDto: type: object properties: id: type: string example: document id base64Encoded: type: boolean example: true content: type: string example: content contentType: type: string example: application/pdf fileName: type: string example: invoice.pdf MetaResponse: type: object properties: warnings: type: array items: type: string example: Field not used by target system pagination: $ref: '#/components/schemas/PaginationResponse' PaginationResponse: type: object properties: total: type: number example: 125 perPage: type: number example: 50 currentPage: type: number example: 1 totalPages: type: number example: 3 ````