# createMediaUpload — Postify API

`POST /v1/media/uploads`

Start a media upload. Issues a presigned upload ticket: PUT the raw file bytes to `upload_url` with the same `Content-Type`, then call POST /v1/media/uploads/{id}/complete. The asset kind (image/video/audio) is inferred from `content_type`.

- Required scope: `posts:write`
- Auth: `Authorization: Bearer postify_live_…` or `x-api-key` header

## Request body

- `filename` (string, required) — Filename including extension.
- `content_type` (string, required) — MIME type of the bytes you will upload.
- `size_bytes` (integer) — Size in bytes, if known.

## Responses

- `201` — The upload ticket. (schema: `CreateUploadResponse`)
- `400` — [`invalid_request`](https://usepostify.com/docs/api/problems/invalid-request.md), [`validation_failed`](https://usepostify.com/docs/api/problems/validation-failed.md)
- `401` — [`authentication_required`](https://usepostify.com/docs/api/problems/authentication-required.md), [`invalid_api_key`](https://usepostify.com/docs/api/problems/invalid-api-key.md)
- `403` — [`insufficient_scope`](https://usepostify.com/docs/api/problems/insufficient-scope.md), [`feature_not_enabled`](https://usepostify.com/docs/api/problems/feature-not-enabled.md)
- `429` — [`rate_limited`](https://usepostify.com/docs/api/problems/rate-limited.md), [`quota_exhausted`](https://usepostify.com/docs/api/problems/quota-exhausted.md)
- `500` — [`internal_error`](https://usepostify.com/docs/api/problems/internal-error.md)

Errors are RFC 9457 `application/problem+json` with a stable `code` and a `request_id`. Full schemas: [interactive reference](https://usepostify.com/docs/api-reference) · [OpenAPI spec](https://app.usepostify.com/v1/openapi.json).

## Example (curl)

```bash
curl -X POST https://app.usepostify.com/v1/media/uploads \
  -H "Authorization: Bearer postify_live_XXXXXXXXXXXXXXXX" \
  -H "Content-Type: application/json" \
  -d '{
  "filename": "launch-teaser.mp4",
  "content_type": "video/mp4",
  "size_bytes": 4718592
}'
```

## Example (TypeScript)

```ts
const res = await fetch("https://app.usepostify.com/v1/media/uploads", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.POSTIFY_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
      "filename": "launch-teaser.mp4",
      "content_type": "video/mp4",
      "size_bytes": 4718592
    }),
});

if (!res.ok) {
  // RFC 9457 problem+json: branch on the stable `code`.
  const problem = await res.json();
  throw new Error(`${problem.code}: ${problem.detail ?? problem.title}`);
}
const data = await res.json();
```