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

# Update an expense

> Updates an existing expense. Requires `expenses:write`. Send an `Idempotency-Key` header for safe retries.



## OpenAPI

````yaml /public_openapi_v1.json put /expenses/{id}
openapi: 3.0.0
info:
  title: Sellfern Public API
  version: 1.0.0
  description: OpenAPI spec for Sellfern Public V1 developer docs.
  contact:
    name: Sellfern Support
    email: support@sellfern.com
servers:
  - url: https://api.sellfern.com
    description: Production API
security:
  - ApiKeyAuth: []
tags:
  - name: Organizations And Stores
  - name: Orders
  - name: Order Items
  - name: Products And Catalog
  - name: Webhooks
paths:
  /expenses/{id}:
    put:
      tags:
        - Expenses
      summary: Update an expense
      description: >-
        Updates an existing expense. Requires `expenses:write`. Send an
        `Idempotency-Key` header for safe retries.
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: integer
            minimum: 1
          description: Expense ID.
        - name: Idempotency-Key
          in: header
          required: false
          schema:
            type: string
          description: Client-generated key to prevent duplicate updates.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ExpenseCreateRequest'
      responses:
        '200':
          description: Expense updated successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ExpenseResponse'
        '400':
          $ref: '#/components/responses/ValidationError'
        '401':
          $ref: '#/components/responses/UnauthorizedError'
        '403':
          $ref: '#/components/responses/ForbiddenError'
        '404':
          $ref: '#/components/responses/NotFoundError'
        '429':
          $ref: '#/components/responses/RateLimitedError'
      security:
        - ApiKeyAuth: []
components:
  schemas:
    ExpenseCreateRequest:
      type: object
      required:
        - category
        - amount
        - date
      properties:
        store_id:
          type: string
          nullable: true
          description: Store ID. Omit or set null for consolidated overhead expenses.
        category:
          type: string
          example: Software
        amount:
          type: number
          example: 49.99
        date:
          type: string
          format: date
          example: '2026-06-01'
        description:
          type: string
          nullable: true
          example: Monthly design tool subscription
        currency:
          type: string
          example: USD
          description: Alias for original_currency.
        original_currency:
          type: string
          example: USD
        base_amount:
          type: number
          nullable: true
          description: Optional payroll base amount.
        bhxh_amount:
          type: number
          nullable: true
          description: Optional payroll insurance amount.
        bhxh_rate:
          type: number
          nullable: true
          description: Optional payroll insurance rate.
        bhxh_type:
          type: string
          nullable: true
          description: Optional payroll insurance type.
        employee_name:
          type: string
          nullable: true
          description: Optional employee name for payroll expenses.
    ExpenseResponse:
      type: object
      properties:
        success:
          type: boolean
          example: true
        data:
          $ref: '#/components/schemas/Expense'
        meta:
          $ref: '#/components/schemas/ResponseMeta'
    Expense:
      type: object
      properties:
        id:
          type: integer
          example: 42
        store_id:
          type: string
          nullable: true
        store_name:
          type: string
          nullable: true
        category:
          type: string
          example: Payroll
        amount:
          type: number
          description: Amount normalized to USD when an exchange rate is available.
        original_amount:
          type: number
          nullable: true
        original_currency:
          type: string
          example: USD
        date:
          type: string
          format: date
        description:
          type: string
          nullable: true
        base_amount:
          type: number
          nullable: true
        bhxh_amount:
          type: number
          nullable: true
        bhxh_rate:
          type: number
          nullable: true
        bhxh_type:
          type: string
          nullable: true
        employee_name:
          type: string
          nullable: true
        created_at:
          type: string
          format: date-time
          nullable: true
    ResponseMeta:
      type: object
      properties:
        request_id:
          type: string
          description: Request identifier, when available.
  responses:
    ValidationError:
      description: Request validation failed.
      content:
        application/json:
          schema:
            type: object
            required:
              - success
              - error
            properties:
              success:
                type: boolean
                example: false
              error:
                type: object
                required:
                  - code
                  - message
                properties:
                  code:
                    type: string
                    example: validation_error
                  message:
                    type: string
                    example: Request validation failed.
              meta:
                $ref: '#/components/schemas/ResponseMeta'
    UnauthorizedError:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            type: object
            required:
              - success
              - error
            properties:
              success:
                type: boolean
                example: false
              error:
                type: object
                required:
                  - code
                  - message
                properties:
                  code:
                    type: string
                    example: unauthorized
                  message:
                    type: string
                    example: Missing or invalid API key.
              meta:
                $ref: '#/components/schemas/ResponseMeta'
    ForbiddenError:
      description: API key lacks the required scope.
      content:
        application/json:
          schema:
            type: object
            required:
              - success
              - error
            properties:
              success:
                type: boolean
                example: false
              error:
                type: object
                required:
                  - code
                  - message
                properties:
                  code:
                    type: string
                    example: missing_scope
                  message:
                    type: string
                    example: Missing required scope.
              meta:
                $ref: '#/components/schemas/ResponseMeta'
    NotFoundError:
      description: Resource not found or outside the authenticated organization.
      content:
        application/json:
          schema:
            type: object
            required:
              - success
              - error
            properties:
              success:
                type: boolean
                example: false
              error:
                type: object
                required:
                  - code
                  - message
                properties:
                  code:
                    type: string
                    example: not_found
                  message:
                    type: string
                    example: Resource not found.
              meta:
                $ref: '#/components/schemas/ResponseMeta'
    RateLimitedError:
      description: Rate limit exceeded.
      content:
        application/json:
          schema:
            type: object
            required:
              - success
              - error
            properties:
              success:
                type: boolean
                example: false
              error:
                type: object
                required:
                  - code
                  - message
                properties:
                  code:
                    type: string
                    example: rate_limited
                  message:
                    type: string
                    example: Rate limit exceeded.
              meta:
                $ref: '#/components/schemas/ResponseMeta'
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key
      description: >-
        Sellfern public API key scoped to the authenticated organization. Do not
        use user JWTs for public integrations.

````