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

# Combine open invoices into one

> Mints a new invoice that collects 2–50 of your open (UNPAID/OVERDUE) invoices so they can be paid in one go. They must share
a currency and billing entity, none may already combine others, and none may already be covered by another open combined
invoice (409). Requires a complete billing address (428).



## OpenAPI

````yaml /api-reference/openapi.yaml post /v1/client/invoices/consolidate
openapi: 3.1.0
info:
  title: Server.Express API
  version: 1.0.0
  description: >-
    The customer-facing Server.Express API: auth, billing, tickets, cloud and
    dedicated servers, hosting, reselling and account management. Every response
    uses the `{ success, data | error }` envelope.
  contact:
    name: Server.Express
    url: https://server.express
servers:
  - url: https://my.server.express/api
    description: Production
security:
  - bearerAuth: []
  - apiToken: []
tags:
  - name: API Tokens
  - name: Account
  - name: Auth
  - name: Cloud
  - name: Coupons
  - name: Credits
  - name: Dashboard
  - name: Dedicated
  - name: Health
  - name: Hosting
  - name: Integrations
  - name: Invoices
  - name: Livechat
  - name: Notifications
  - name: Passkeys
  - name: Payments
  - name: Products
  - name: Public
  - name: Public Invoices
  - name: Public Tools
  - name: Reseller
  - name: SSH Keys
  - name: Services
  - name: Tasks
  - name: Teams
  - name: Tickets
  - name: Web Hosting
  - name: Webhooks
paths:
  /v1/client/invoices/consolidate:
    post:
      tags:
        - Invoices
      summary: Combine open invoices into one
      description: >-
        Mints a new invoice that collects 2–50 of your open (UNPAID/OVERDUE)
        invoices so they can be paid in one go. They must share

        a currency and billing entity, none may already combine others, and none
        may already be covered by another open combined

        invoice (409). Requires a complete billing address (428).
      operationId: publicClientConsolidateInvoices
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - invoiceIds
              properties:
                invoiceIds:
                  type: array
                  minItems: 2
                  maxItems: 50
                  items:
                    type: string
                    format: uuid
      responses:
        '201':
          description: Combined invoice created.
          content:
            application/json:
              schema:
                type: object
                required:
                  - success
                  - data
                properties:
                  success:
                    type: boolean
                    const: true
                  data:
                    type: object
                    required:
                      - invoiceId
                      - invoiceNumber
                      - total
                      - currency
                      - covers
                    properties:
                      invoiceId:
                        type: string
                        format: uuid
                      invoiceNumber:
                        type: string
                      total:
                        type: integer
                        description: Minor units.
                      currency:
                        type: string
                      covers:
                        type: integer
                        description: How many invoices it collects.
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '409':
          $ref: '#/components/responses/Conflict'
        '428':
          description: The account has no complete billing address yet.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PublicClientBillingDetailsRequired'
        '500':
          $ref: '#/components/responses/ServerError'
      security:
        - bearerAuth: []
        - apiToken: []
components:
  responses:
    BadRequest:
      description: Validation failed or the request is malformed.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    Unauthorized:
      description: Missing, invalid or expired credentials.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    Forbidden:
      description: >-
        Authenticated but not allowed (missing scope, not an admin, or not your
        resource).
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    NotFound:
      description: The resource doesn't exist or isn't visible to you.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    Conflict:
      description: The request conflicts with the resource's current state.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    ServerError:
      description: Unexpected server error.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  schemas:
    PublicClientBillingDetailsRequired:
      type: object
      description: >-
        428 Precondition Required — add the listed billing fields before
        ordering or paying.
      required:
        - success
        - error
        - data
      properties:
        success:
          type: boolean
          const: false
        error:
          type: string
        data:
          type: object
          required:
            - billingDetailsRequired
            - missing
          properties:
            billingDetailsRequired:
              type: boolean
              const: true
            missing:
              type: array
              items:
                type: string
                enum:
                  - addressLine1
                  - city
                  - postcode
                  - country
                  - companyName
    ErrorResponse:
      type: object
      required:
        - success
        - error
      properties:
        success:
          type: boolean
          const: false
        error:
          type: string
          description: Human-readable error message.
      additionalProperties: true
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: >-
        Session access token (JWT) from POST /v1/auth/login or /v1/auth/refresh.
        A session satisfies every API scope.
    apiToken:
      type: http
      scheme: bearer
      bearerFormat: se_live_<prefix>_<secret>
      description: >-
        Personal API token created under Settings → API tokens. Only routes
        guarded by verifyApiAuth accept it, and the token must carry the scope
        named in the operation's x-required-scope.

````

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