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

# Create adjustment invoice

> Create a one-off adjustment invoice and return the created invoice. Use a negative amount for a credit.

Create a one-off adjustment invoice and return the created invoice. Use a negative amount for a credit.


## OpenAPI

````yaml /openapi/es/rest/2026-08-27.json post /invoices
openapi: 3.1.0
info:
  title: Commet API
  version: '2026-08-27'
  description: Billing and payments API for SaaS and AI products.
servers:
  - url: https://commet.co/api/v1
security:
  - ApiKeyAuth: []
tags:
  - name: Test Clock
    description: >-
      Simulate the passage of time in sandbox to test billing flows. Mirrors
      Stripe test clocks: forward-only and sandbox-only.
  - name: Customers
  - name: Subscriptions
  - name: Plans
  - name: Markets
    description: >-
      Reusable country groups for market-specific prices and selectable price
      variants.
  - name: Offers
  - name: Promo Codes
  - name: Features
  - name: Usage
  - name: Seats
  - name: Quota
  - name: Add-ons
  - name: Portal
  - name: Credit Packs
  - name: Plan Groups
  - name: Invoices
  - name: Payments
    description: >-
      One-time payments with no subscription or plan. Charge a customer's saved
      payment method off-session, or create a payment link the customer opens to
      pay. Tax, invoice, and receipt are handled automatically.
  - name: Transactions
  - name: Webhooks
  - name: API Keys
  - name: Payouts
    description: >-
      Withdraw available balance to your bank and manage the payout account
      (verification + destination bank accounts).
  - name: Provisioning
    description: >-
      Take ownership of an organization an agent provisioned headlessly. The
      agent holds the API keys from the start; a human claims the account
      through a claim link.
paths:
  /invoices:
    post:
      tags:
        - Invoices
      summary: Create adjustment invoice
      description: >-
        Create a one-off adjustment invoice and return the created invoice. Use
        a negative amount for a credit.
      operationId: create-adjustment-invoice
      parameters:
        - name: Idempotency-Key
          in: header
          required: false
          description: >-
            Unique key used to safely retry this write for 24 hours without
            applying it twice.
          schema:
            type: string
            minLength: 1
            maxLength: 200
        - name: Commet-Version
          in: header
          required: false
          description: >-
            API version used by this reference. Send this header to select this
            contract explicitly.
          schema:
            type: string
            default: '2026-08-27'
          example: '2026-08-27'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                customerId:
                  type: string
                  minLength: 1
                amount:
                  type: integer
                  minimum: -9007199254740991
                  maximum: 9007199254740991
                description:
                  type: string
                  minLength: 1
                metadata:
                  type: object
                  propertyNames:
                    type: string
                  additionalProperties: {}
              required:
                - customerId
                - amount
                - description
      responses:
        '201':
          description: Success
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
            RateLimit-Limit:
              description: Maximum number of requests allowed in the current window.
              schema:
                type: string
            RateLimit-Remaining:
              description: Requests remaining in the current window.
              schema:
                type: string
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Invoice'
              example:
                id: inv_1a2b3c4d
                customerId: cus_1a2b3c4d
                subscriptionId: null
                invoiceNumber: INV-2026-0001
                status: outstanding
                invoiceType: adjustment
                currency: usd
                subtotal: 500
                discountAmount: 0
                taxAmount: 0
                total: 500
                periodStart: '2026-09-07T12:00:00.000Z'
                periodEnd: '2026-10-07T12:00:00.000Z'
                issueDate: '2026-09-07T12:00:00.000Z'
                dueDate: '2026-09-07T12:00:00.000Z'
                memo: Additional support session
                metadata: {}
                createdAt: '2026-09-07T12:00:00.000Z'
                updatedAt: '2026-09-07T12:00:00.000Z'
                creditApplied: 0
                planName: null
                poNumber: null
                reference: null
                lineItems:
                  - lineType: one_time
                    featureName: null
                    description: Additional support session
                    quantity: 1
                    unitAmount: 500
                    amount: 500
                    includedAmount: null
                    usedAmount: null
                    overageAmount: null
                    discountType: null
                    discountValue: null
                    discountName: null
                    chargeType: standard
                object: invoice
                livemode: false
        '400':
          description: Bad request
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: validation_error
                  code: validation_error
                  message: The request contains an invalid parameter.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/validation_error.md
        '401':
          description: Unauthorized
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: authentication_error
                  code: unauthorized
                  message: A valid API key is required.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/unauthorized.md
        '403':
          description: Forbidden
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: authentication_error
                  code: forbidden
                  message: You do not have permission to perform this operation.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/forbidden.md
        '404':
          description: Not found
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: not_found_error
                  code: not_found
                  message: The requested resource was not found.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/not_found.md
        '409':
          description: Conflict
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: conflict_error
                  code: idempotency_in_progress
                  message: >-
                    A request with this idempotency key is still being
                    processed.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/idempotency_in_progress.md
        '429':
          description: Too many requests
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
            RateLimit-Limit:
              description: Maximum number of requests allowed in the current window.
              schema:
                type: string
            RateLimit-Remaining:
              description: Requests remaining in the current window.
              schema:
                type: string
            RateLimit-Reset:
              description: Seconds until the rate limit window resets.
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying the request.
              schema:
                type: string
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: rate_limit_error
                  code: rate_limited
                  message: >-
                    Too many requests. Retry after the interval specified in the
                    Retry-After header.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/rate_limited.md
        '500':
          description: Internal server error
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: internal_error
                  code: internal_error
                  message: An unexpected error occurred while processing the request.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/internal_error.md
        '503':
          description: Service unavailable
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  type: internal_error
                  code: idempotency_unavailable
                  message: >-
                    Idempotency storage is temporarily unavailable. Retry with
                    the same idempotency key.
                  doc_url: >-
                    https://commet.co/docs/api-reference/2026-08-27/errors/idempotency_unavailable.md
      x-codeSamples:
        - lang: typescript
          label: TypeScript
          source: |-
            import { Commet } from "@commet/node";

            const commet = new Commet({ apiKey: "ck_xxx" });

            const invoice = await commet.invoices.createAdjustment({
              customerId: "user_123",
              amount: 5000,
              description: "Customer requested",
            });
        - lang: python
          label: Python
          source: |-
            from commet import Commet

            commet = Commet("ck_xxx")

            invoice = commet.invoices.create_adjustment(
                customer_id="user_123",
                amount=5000,
                description="Customer requested",
            )
        - lang: go
          label: Go
          source: "client, err := commet.New(\"ck_xxx\")\nif err != nil {\n\tlog.Fatal(err)\n}\nctx := context.Background()\n\ninvoice, err := client.Invoices.CreateAdjustment(ctx, &commet.CreateAdjustmentInvoiceParams{\n\tCustomerID: \"user_123\",\n\tAmount: 5000,\n\tDescription: \"Customer requested\",\n})\nif err != nil {\n\tlog.Fatal(err)\n}"
        - lang: java
          label: Java
          source: |-
            import co.commet.Commet;
            import co.commet.params.CreateAdjustmentInvoiceParams;

            var commet = Commet.builder().apiKey("ck_xxx").build();

            var invoice = commet.invoices().createAdjustment(
                CreateAdjustmentInvoiceParams.builder("user_123", 5000L, "Customer requested").build()
            );
        - lang: php
          label: PHP
          source: |-
            use Commet\Commet;

            $commet = new Commet('ck_xxx');

            $invoice = $commet->invoices->createAdjustment(
                customerId: 'user_123',
                amount: 5000,
                description: 'Customer requested',
            );
components:
  headers:
    RequestId:
      description: >-
        Server-generated identifier that correlates this response with Platform
        logs.
      schema:
        type: string
        format: uuid
  schemas:
    Invoice:
      type: object
      properties:
        id:
          type: string
        customerId:
          type: string
        subscriptionId:
          anyOf:
            - type: string
            - type: 'null'
        invoiceNumber:
          type: string
        status:
          type: string
          enum:
            - draft
            - outstanding
            - paid
            - void
            - uncollectible
        invoiceType:
          $ref: '#/components/schemas/InvoiceType'
        currency:
          type: string
        subtotal:
          type: integer
          minimum: -9007199254740991
          maximum: 9007199254740991
        discountAmount:
          type: integer
          minimum: -9007199254740991
          maximum: 9007199254740991
        taxAmount:
          type: integer
          minimum: -9007199254740991
          maximum: 9007199254740991
        total:
          type: integer
          minimum: -9007199254740991
          maximum: 9007199254740991
        periodStart:
          type: string
          format: date-time
        periodEnd:
          type: string
          format: date-time
        issueDate:
          type: string
          format: date-time
        dueDate:
          type: string
          format: date-time
        memo:
          anyOf:
            - type: string
            - type: 'null'
        metadata:
          type: object
          propertyNames:
            type: string
          additionalProperties: {}
        createdAt:
          type: string
          format: date-time
        updatedAt:
          type: string
          format: date-time
        creditApplied:
          type: integer
          minimum: -9007199254740991
          maximum: 9007199254740991
        planName:
          anyOf:
            - type: string
            - type: 'null'
        poNumber:
          anyOf:
            - type: string
            - type: 'null'
        reference:
          anyOf:
            - type: string
            - type: 'null'
        lineItems:
          type: array
          items:
            type: object
            properties:
              lineType:
                type: string
                enum:
                  - plan_base
                  - feature_overage
                  - feature_seats
                  - feature_quota
                  - discount
                  - promo_code_discount
                  - credit
                  - balance_overage
                  - addon_base
                  - one_time
              featureName:
                anyOf:
                  - type: string
                  - type: 'null'
              description:
                type: string
              quantity:
                type: integer
                minimum: -9007199254740991
                maximum: 9007199254740991
              unitAmount:
                type: integer
                minimum: -9007199254740991
                maximum: 9007199254740991
              amount:
                type: integer
                minimum: -9007199254740991
                maximum: 9007199254740991
              includedAmount:
                anyOf:
                  - type: integer
                    minimum: -9007199254740991
                    maximum: 9007199254740991
                  - type: 'null'
              usedAmount:
                anyOf:
                  - type: integer
                    minimum: -9007199254740991
                    maximum: 9007199254740991
                  - type: 'null'
              overageAmount:
                anyOf:
                  - type: integer
                    minimum: -9007199254740991
                    maximum: 9007199254740991
                  - type: 'null'
              discountType:
                anyOf:
                  - type: string
                  - type: 'null'
              discountValue:
                anyOf:
                  - type: integer
                    minimum: -9007199254740991
                    maximum: 9007199254740991
                  - type: 'null'
              discountName:
                anyOf:
                  - type: string
                  - type: 'null'
              chargeType:
                type: string
                enum:
                  - standard
                  - advance
                  - true_up
            required:
              - lineType
              - featureName
              - description
              - quantity
              - unitAmount
              - amount
              - includedAmount
              - usedAmount
              - overageAmount
              - discountType
              - discountValue
              - discountName
              - chargeType
            additionalProperties: false
        object:
          type: string
          const: invoice
        livemode:
          type: boolean
      required:
        - id
        - customerId
        - subscriptionId
        - invoiceNumber
        - status
        - invoiceType
        - currency
        - subtotal
        - discountAmount
        - taxAmount
        - total
        - periodStart
        - periodEnd
        - issueDate
        - dueDate
        - memo
        - metadata
        - createdAt
        - updatedAt
        - creditApplied
        - planName
        - poNumber
        - reference
        - lineItems
        - object
        - livemode
      additionalProperties: false
    ErrorResponse:
      type: object
      properties:
        error:
          type: object
          properties:
            type:
              type: string
            code:
              type: string
            message:
              type: string
            param:
              type: string
            details: {}
            doc_url:
              type: string
          required:
            - type
            - code
            - message
            - doc_url
          additionalProperties: false
      required:
        - error
      additionalProperties: false
    InvoiceType:
      type: string
      enum:
        - recurring
        - overage
        - plan_change
        - adjustment
        - credit_purchase
        - balance_topup
        - addon_activation
        - one_time_payment
        - reactivation
        - resume
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key

````

## Related topics

- [CLI](/docs/es/cli.md)
- [invoice.created](/docs/es/webhooks/invoice-created.md)
- [Create a payment link](/docs/es/api-reference/payments/create-payment.md)
- [List invoices](/docs/es/api-reference/invoices/list-invoices.md)
- [Get invoice](/docs/es/api-reference/invoices/get-invoice.md)


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