---
title: "Add or replace a timeline item with a completed pinned source render"
method: POST
path: "/projects/{projectId}/source/apply"
tags: ["Creative Source"]
---

# Add or replace a timeline item with a completed pinned source render

`POST /projects/{projectId}/source/apply`

## Request

- Base URL: `https://blitzreels.com/api/v1`
- URL: `https://blitzreels.com/api/v1/projects/{projectId}/source/apply`
- Auth: API key in header `Authorization`

Add or replace a timeline item with a completed pinned source render.

## Path parameters

- `projectId` string, uuid, required

## Headers

- `Idempotency-Key` string, required

## Request body

- object
  - `timelineItemId` string, uuid, nullable, required
  - `jobId` string, uuid, required
  - `expectedSourceRevision` integer, required
  - `expectedProjectRevision` integer, required

## Response `200`

Successful response

- object
  - `projectId` string, uuid, required
  - `timelineItemId` string, uuid, required
  - `jobId` string, uuid, required
  - `sourceRevision` integer, required
  - `revision` integer, required
  - `mutationReceiptId` string, uuid, required
  - `replayed` boolean, required

## Other responses

- `400`: Invalid input data
- `401`: Authorization not provided
- `403`: Insufficient access
- `500`: Internal server error

---

[API](https://skmtc.dev/blitzreels/apis/blitzreels-api.md) · [All operations](https://skmtc.dev/blitzreels/apis/blitzreels-api/llms.txt) · [OpenAPI document](https://skmtc.dev/blitzreels/apis/blitzreels-api/revisions/35608b12471d?raw)