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

> ## Agent Instructions
> Use Stable documentation by default. Honor an explicit Beta request or a URL under /docs/beta/. If the requested version conflicts with the installed CLI package or API origin, clarify the target before writing integration code.
> Pages under /docs/beta/ document Beta; other product pages document Stable. Keep the CLI package, commands, API origin, and credentials within the selected version. State the documentation version in your answer.
> For MCP search, always pass version: Stable or version: Beta. Unfiltered search mixes both versions. For filesystem reads, keep Beta queries under /beta/ and exclude /beta/ from Stable queries; discover paths before reading them.
> The public docs base is https://photon.codes/docs. Convert MCP page paths to public URLs under that base, preserving /beta/ when present. Read https://photon.codes/docs/skill.md for version selection and https://photon.codes/docs/llms.txt for the version indexes.

# List webhook API versions

> List webhook API versions: listWebhookApiVersions in the TypeScript, Python and Rust clients.

`GET /v1/projects/{projectId}/webhooks/api-versions`

Lists the published webhook payload API versions and their lifecycle metadata. The list is the same for every project. Use the selectable indicator when choosing a version for a destination. These payload dates are separate from SDK package versions. An authorized conditional request may return 304 without a response body.

<Tabs>
  <Tab title="TypeScript">
    ```typescript TypeScript theme={null}
    photon.projects.listWebhookApiVersions(input: ListWebhookApiVersionsInput, options?: RequestOptions): Promise<ListWebhookApiVersionsOutput>
    ```
  </Tab>

  <Tab title="Python">
    ```python Python theme={null}
    photon.projects.list_webhook_api_versions(input: ListWebhookApiVersionsInput) -> models.ListWebhookApiVersionsResponse | None
    ```
  </Tab>

  <Tab title="Rust">
    ```rust Rust theme={null}
    client.list_webhook_api_versions(project_id: String).await -> Result<ResponseValue<ListWebhookApiVersionsResponse>, Error<ListWebhookApiVersionsError>>
    ```
  </Tab>
</Tabs>

<RequestExample>
  ```typescript TypeScript theme={null}
  import { Photon } from "@photon-ai/api";

  const photon = new Photon({
    headers: { Authorization: `Bearer ${process.env.PHOTON_API_TOKEN}` },
  });
  const result = await photon.projects.listWebhookApiVersions({
    path: {
      projectId: "projectId",
    },
  });
  ```

  ```python Python theme={null}
  import os

  from photon_api import Photon
  from photon_api.rpc_generated import ListWebhookApiVersionsInput

  photon = Photon(headers={"Authorization": f"Bearer {os.environ['PHOTON_API_TOKEN']}"})
  result = photon.projects.list_webhook_api_versions(
      ListWebhookApiVersionsInput.model_validate({
          "path": {
              "projectId": "projectId",
          },
      })
  )
  ```

  ```rust Rust theme={null}
  use photon_ai_api::{Credential, PhotonClientBuilder, SecretString};

  let token = std::env::var("PHOTON_API_TOKEN")?;
  let client = PhotonClientBuilder::new()
      .credential("accountServiceKey", Credential::Bearer(SecretString::from(token)))
      .build()?;
  let result = client
      .list_webhook_api_versions("projectId".to_owned())
      .await
      .map_err(|error| format!("{error:?}"))?
      .into_inner();
  ```
</RequestExample>

<ResponseExample>
  ```json 200 theme={null}
  {
    "apiVersions": [
      {
        "retirement": null,
        "selectable": true,
        "status": "preview",
        "successor": null,
        "version": "2026-01-01"
      }
    ],
    "contractNamespace": "@photon-hq/contracts",
    "packageVersion": "string"
  }
  ```
</ResponseExample>

## Parameters

<ParamField path="projectId" type={"string"} required />

## Returns

**`200`** Published webhook payload API versions. ListWebhookApiVersionsResponse

<ResponseField name="apiVersions" type={"array of WebhookApiVersion"} required />

<ResponseField name="contractNamespace" type={"\"@photon-hq/contracts\""} required />

<ResponseField name="packageVersion" type={"string"} required />

**`304`** The authorized cached representation is current; no response body. No body.


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