curl --request POST \
  --url https://commet.co/api/v1/invoices \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "customerId": "<string>",
  "amount": 0,
  "description": "<string>"
}
'

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",
});

from commet import Commet

commet = Commet("ck_xxx")

invoice = commet.invoices.create_adjustment(
    customer_id="user_123",
    amount=5000,
    description="Customer requested",
)

client, err := commet.New("ck_xxx")
if err != nil {
	log.Fatal(err)
}
ctx := context.Background()

invoice, err := client.Invoices.CreateAdjustment(ctx, &commet.CreateAdjustmentInvoiceParams{
	CustomerID: "user_123",
	Amount: 5000,
	Description: "Customer requested",
})
if err != nil {
	log.Fatal(err)
}

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()
);

use Commet\Commet;

$commet = new Commet('ck_xxx');

$invoice = $commet->invoices->createAdjustment(
    customerId: 'user_123',
    amount: 5000,
    description: 'Customer requested',
);

{
  "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
}

{
  "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"
  }
}

{
  "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"
  }
}

{
  "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"
  }
}

{
  "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"
  }
}

{
  "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"
  }
}

{
  "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"
  }
}

{
  "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"
  }
}

{
  "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"
  }
}