> ## Documentation Index
> Fetch the complete documentation index at: https://upstash-vector.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Getting Started

## Install

### PyPI

```bash
pip install upstash-qstash
```

## Get QStash token

Follow the instructions [here](/qstash/overall/getstarted) to get your QStash token and signing keys.

## Usage

#### Synchronous Client

```python
from upstash_qstash import Client
client = Client("<QSTASH_TOKEN>")

def handler():
  client.publish_json(...)

if __name__ == "__main__":
  main()
```

#### Asynchronous Client

```python
import asyncio
from upstash_qstash.asyncio import Client

async def handler():
  await client.publish_json(...)

if __name__ == "__main__":
  asyncio.run(main())
```

#### RetryConfig

You can configure the retry policy of the client by passing the configuration to the client constructor.

Note: This isn for sending the request to QStash, not for the retry policy of QStash.

The default number of attempts is **6** and the default backoff function is `lambda retry_count: math.exp(retry_count) * 50`.

You can also pass in `False` to disable retrying.

```python
from upstash_qstash import Client
client = Client("<QSTASH_TOKEN>", {
  "attempts": 3,
  "backoff": lambda retry_count: (2 ** retry_count) * 20,
})
```