curl --request GET \
  --url https://commet.co/api/v1/invoices/{id} \
  --header 'x-api-key: <api-key>'

import { Commet } from "@commet/node";

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

const invoice = await commet.invoices.get({ id: "inv_xxx" });

from commet import Commet

commet = Commet("ck_xxx")

invoice = commet.invoices.get("inv_xxx")

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

invoice, err := client.Invoices.Get(ctx, "inv_xxx")
if err != nil {
	log.Fatal(err)
}

import co.commet.Commet;

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

var invoice = commet.invoices().get("inv_xxx");

use Commet\Commet;

$commet = new Commet('ck_xxx');

$invoice = $commet->invoices->get(id: 'inv_xxx');

{
  "id": "inv_1a2b3c4d",
  "customerId": "cus_1a2b3c4d",
  "subscriptionId": "sub_1a2b3c4d",
  "invoiceNumber": "INV-2026-0001",
  "status": "paid",
  "invoiceType": "recurring",
  "currency": "usd",
  "subtotal": 2000,
  "discountAmount": 0,
  "taxAmount": 0,
  "total": 2000,
  "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": null,
  "metadata": {},
  "createdAt": "2026-09-07T12:00:00.000Z",
  "updatedAt": "2026-09-07T12:00:00.000Z",
  "creditApplied": 0,
  "planName": "Pro",
  "poNumber": null,
  "reference": null,
  "lineItems": [
    {
      "lineType": "plan_base",
      "featureName": null,
      "description": "Pro — monthly subscription",
      "quantity": 1,
      "unitAmount": 2000,
      "amount": 2000,
      "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": "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"
  }
}