curl --request PATCH \
  --url https://commet.co/api/v1/offers/{id} \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "name": "<string>",
  "phases": [
    {
      "type": "free_trial",
      "durationDays": 123
    }
  ]
}
'

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

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

const offer = await commet.offers.update({
  id: "ofr_xxx",
  name: "example",
  phases: [
    {
      type: "free_trial",
      durationDays: 30,
    },
  ],
});

from commet import Commet

commet = Commet("ck_xxx")

offer = commet.offers.update(
    "ofr_xxx",
    name="example",
    phases=[{"type": "free_trial", "duration_days": 30}],
)

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

offer, err := client.Offers.Update(ctx, "ofr_xxx", &commet.UpdateOfferParams{
	Name: "example",
	Phases: []commet.UpdateOfferParamsPhasesItem{{Value: commet.UpdateOfferParamsPhasesItemVariant1{
		Type: "free_trial",
		DurationDays: 30,
	}}},
})
if err != nil {
	log.Fatal(err)
}

import co.commet.Commet;
import co.commet.models.UpdateOfferParamsPhasesItemVariant1;
import co.commet.params.UpdateOfferParams;
import java.util.List;

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

var offer = commet.offers().update(
    "ofr_xxx",
    UpdateOfferParams.builder("example", List.of(new UpdateOfferParamsPhasesItemVariant1("free_trial", 30L))).build()
);

use Commet\Commet;

$commet = new Commet('ck_xxx');

$offer = $commet->offers->update(
    id: 'ofr_xxx',
    name: 'example',
    phases: [['type' => 'free_trial', 'duration_days' => 30]],
);

{
  "id": "offer_1a2b3c4d",
  "name": "Launch discount",
  "phases": [
    {
      "type": "percentage",
      "durationCycles": 3,
      "durationInterval": "monthly",
      "percentage": 20
    }
  ],
  "metadata": {},
  "startsAt": null,
  "endsAt": null,
  "active": true,
  "createdAt": "2026-09-07T12:00:00.000Z",
  "updatedAt": "2026-09-07T12:00:00.000Z",
  "object": "offer",
  "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"
  }
}