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Python library for the Lithic API :snake:

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# Lithic Python API library

[![PyPI version](https://img.shields.io/pypi/v/lithic.svg?label=pypi%20(stable))](https://pypi.org/project/lithic/)

The Lithic Python library provides convenient access to the Lithic REST API from any Python 3.9+
application. The library includes type definitions for all request params and response fields,
and offers both synchronous and asynchronous clients powered by [httpx](https://github.com/encode/httpx).

## MCP Server

Use the Lithic MCP Server to enable AI assistants to interact with this API, allowing them to explore endpoints, make test requests, and use documentation to help integrate this SDK into your application.

[![Add to Cursor](https://cursor.com/deeplink/mcp-install-dark.svg)](https://cursor.com/en-US/install-mcp?name=lithic-mcp&config=eyJuYW1lIjoibGl0aGljLW1jcCIsInRyYW5zcG9ydCI6Imh0dHAiLCJ1cmwiOiJodHRwczovL2xpdGhpYy5zdGxtY3AuY29tIiwiaGVhZGVycyI6eyJ4LWxpdGhpYy1hcGkta2V5IjoiTXkgTGl0aGljIEFQSSBLZXkifX0)
[![Install in VS Code](https://img.shields.io/badge/_-Add_to_VS_Code-blue?style=for-the-badge&logo=data:image/svg%2bxml;base64,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)](https://vscode.stainless.com/mcp/%7B%22name%22%3A%22lithic-mcp%22%2C%22type%22%3A%22http%22%2C%22url%22%3A%22https%3A%2F%2Flithic.stlmcp.com%22%2C%22headers%22%3A%7B%22x-lithic-api-key%22%3A%22My%20Lithic%20API%20Key%22%7D%7D)

> Note: You may need to set environment variables in your MCP client.

## Documentation

The REST API documentation can be found on [docs.lithic.com](https://docs.lithic.com). The full API of this library can be found in [api.md](api.md).

## Installation

```sh
# install from PyPI
pip install lithic
```

## Usage

The full API of this library can be found in [api.md](api.md).

```python
import os
from lithic import Lithic

client = Lithic(
    api_key=os.environ.get("LITHIC_API_KEY"),  # This is the default and can be omitted
    # defaults to "production".
    environment="sandbox",
)

card = client.cards.create(
    type="SINGLE_USE",
)
print(card.token)
```

While you can provide an `api_key` keyword argument,
we recommend using [python-dotenv](https://pypi.org/project/python-dotenv/)
to add `LITHIC_API_KEY="My Lithic API Key"` to your `.env` file
so that your API Key is not stored in source control.

## Async usage

Simply import `AsyncLithic` instead of `Lithic` and use `await` with each API call:

```python
import os
import asyncio
from lithic import AsyncLithic

client = AsyncLithic(
    api_key=os.environ.get("LITHIC_API_KEY"),  # This is the default and can be omitted
    # defaults to "production".
    environment="sandbox",
)

async def main() -> None:
    card = await client.cards.create(
        type="SINGLE_USE",
    )
    print(card.token)

asyncio.run(main())
```

Functionality between the synchronous and asynchronous clients is otherwise identical.

### With aiohttp

By default, the async client uses `httpx` for HTTP requests. However, for improved concurrency performance you may also use `aiohttp` as the HTTP backend.

You can enable this by installing `aiohttp`:

```sh
# install from PyPI
pip install lithic[aiohttp]
```

Then you can enable it by instantiating the client with `http_client=DefaultAioHttpClient()`:

```python
import os
import asyncio
from lithic import DefaultAioHttpClient
from lithic import AsyncLithic

async def main() -> None:
    async with AsyncLithic(
        api_key=os.environ.get("LITHIC_API_KEY"),  # This is the default and can be omitted
        http_client=DefaultAioHttpClient(),
    ) as client:
        card = await client.cards.create(
            type="SINGLE_USE",
        )
        print(card.token)

asyncio.run(main())
```

## Using types

Nested request parameters are [TypedDicts](https://docs.python.org/3/library/typing.html#typing.TypedDict). Responses are [Pydantic models](https://docs.pydantic.dev) which also provide helper methods for things like:

- Serializing back into JSON, `model.to_json()`
- Converting to a dictionary, `model.to_dict()`

Typed requests and responses provide autocomplete and documentation within your editor. If you would like to see type errors in VS Code to help catch bugs earlier, set `python.analysis.typeCheckingMode` to `basic`.

## Pagination

List methods in the Lithic API are paginated.

This library provides auto-paginating iterators with each list response, so you do not have to request successive pages manually:

```python
from lithic import Lithic

client = Lithic()

all_cards = []
# Automatically fetches more pages as needed.
for card in client.cards.list():
    # Do something with card here
    all_cards.append(card)
print(all_cards)
```

Or, asynchronously:

```python
import asyncio
from lithic import AsyncLithic

client = AsyncLithic()

async def main() -> None:
    all_cards = []
    # Iterate through items across all pages, issuing requests as needed.
    async for card in client.cards.list():
        all_cards.append(card)
    print(all_cards)

asyncio.run(main())
```

Alternatively, you can use the `.has_next_page()`, `.next_page_info()`, or `.get_next_page()` methods for more granular control working with pages:

```python
first_page = await client.cards.list()
if first_page.has_next_page():
    print(f"will fetch next page using these details: {first_page.next_page_info()}")
    next_page = await first_page.get_next_page()
    print(f"number of items we just fetched: {len(next_page.data)}")

# Remove `await` for non-async usage.
```

Or just work directly with the returned data:

```python
first_page = await client.cards.list()

print(f"next page cursor: {first_page.starting_after}")  # => "next page cursor: ..."
for card in first_page.data:
    print(card.product_id)

# Remove `await` for non-async usage.
```

## Nested params

Nested parameters are dictionaries. The SDK uses TypedDict for type validation, but you can pass regular dictionaries as shown below:

```python
from lithic import Lithic

client = Lithic()

card = client.cards.create(
    type="PHYSICAL",
    shipping_address={
        "address1": "123",
        "city": "NEW YORK",
        "country": "USA",
        "first_name": "Johnny",
        "last_name": "Appleseed",
        "postal_code": "10001",
        "state": "NY",
    },
)
```

## Webhooks

Lithic uses webhooks to notify your application when events happen. The library provides signature verification via the optional `standardwebhooks` package.

### Parsing and verifying webhooks

```py
from lithic.types import CardCreatedWebhookEvent

# Verifies signature and returns typed event
event = client.webhooks.parse(
    request.body,  # raw request body as string
    headers=request.headers,
    secret=os.environ["LITHIC_WEBHOOK_SECRET"]  # optional, reads from env by default
)

# Use isinstance to narrow the type
if isinstance(event, CardCreatedWebhookEvent):
    print(f"Card created: {event.card_token}")
```

### Parsing without verification

```py
# Parse only - skips signature verification (not recommended for production)
event = client.webhooks.parse_unsafe(request.body)
```

### Verifying signatures only

```py
# Verify signature without parsing (raises exception if invalid)
client.webhooks.verify_signature(request.body, headers=request.headers, secret=secret)
```

### Installing standardwebhooks (optional)

To use signature verification, install the webhooks extra:

```sh
pip install lithic[webhooks]
```

## Handling errors

When the library is unable to connect to the API (for example, due to network connection problems or a timeout), a subclass of `lithic.APIConnectionError` is raised.

When the API returns a non-success status code (that is, 4xx or 5xx
response), a subclass of `lithic.APIStatusError` is raised, containing `status_code` and `response` properties.

All errors inherit from `lithic.APIError`.

```python
import lithic
from lithic import Lithic

client = Lithic()

try:
    client.cards.create(
        type="MERCHANT_LOCKED",
    )
except lithic.APIConnectionError as e:
    print("The server could not be reached")
    print(e.__cause__)  # an underlying Exception, likely raised within httpx.
except lithic.RateLimitError as e:
    print("A 429 status code was received; we should back off a bit.")
except lithic.APIStatusError as e:
    print("Another non-200-range status code was received")
    print(e.status_code)
    print(e.response)
```

Error codes are as follows:

| Status Code | Error Type                 |
| ----------- | -------------------------- |
| 400         | `BadRequestError`          |
| 401         | `AuthenticationError`      |
| 403         | `PermissionDeniedError`    |
| 404         | `NotFoundError`            |
| 422         | `UnprocessableEntityError` |
| 429         | `RateLimitError`           |
| >=500       | `InternalServerError`      |
| N/A         | `APIConnectionError`       |

### Retries

Certain errors are automatically retried 2 times by default, with a short exponential backoff.
Connection errors (for example, due to a network connectivity problem), 408 Request Timeout, 409 Conflict,
429 Rate Limit, and >=500 Internal errors are all retried by default.

You can use the `max_retries` option to configure or disable retry settings:

```python
from lithic import Lithic

# Configure the default for all requests:
client = Lithic(
    # default is 2
    max_retries=0,
)

# Or, configure per-request:
client.with_options(max_retries=5).cards.list(
    page_size=10,
)
```

### Timeouts

By default requests time out after 1 minute. You can configure this with a `timeout` option,
which accepts a float or an [`httpx.Timeout`](https://www.python-httpx.org/advanced/timeouts/#fine-tuning-the-configuration) object:

```python
from lithic import Lithic

# Configure the default for all requests:
client = Lithic(
    # 20 seconds (default is 1 minute)
    timeout=20.0,
)

# More granular control:
client = Lithic(
    timeout=httpx.Timeout(60.0, read=5.0, write=10.0, connect=2.0),
)

# Override per-request:
client.with_options(timeout=5.0).cards.list(
    page_size=10,
)
```

On timeout, an `APITimeoutError` is thrown.

Note that requests that time out are [retried twice by default](#retries).

## Advanced

### Logging

We use the standard library [`logging`](https://docs.python.org/3/library/logging.html) module.

You can enable logging by setting the environment variable `LITHIC_LOG` to `info`.

```shell
$ export LITHIC_LOG=info
```

Or to `debug` for more verbose logging.

### How to tell whether `None` means `null` or missing

In an API response, a field may be explicitly `null`, or missing entirely; in either case, its value is `None` in this library. You can differentiate the two cases with `.model_fields_set`:

```py
if response.my_field is None:
  if 'my_field' not in response.model_fields_set:
    print('Got json like {}, without a "my_field" key present at all.')
  else:
    print('Got json like {"my_field": null}.')
```

### Accessing raw response data (e.g. headers)

The "raw" Response object can be accessed by prefixing `.with_raw_response.` to any HTTP method call, e.g.,

```py
from lithic import Lithic

client = Lithic()
response = client.cards.with_raw_response.create(
    type="SINGLE_USE",
)
print(response.headers.get('X-My-Header'))

card = response.parse()  # get the object that `cards.create()` would have returned
print(card.token)
```

These methods return a [`LegacyAPIResponse`](https://github.com/lithic-com/lithic-python/tree/main/src/lithic/_legacy_response.py) object. This is a legacy class as we're changing it slightly in the next major version.

For the sync client this will mostly be the same with the exception
of `content` & `text` will be methods instead of properties. In the
async client, all methods will be async.

A migration script will be provided & the migration in general should
be smooth.

#### `.with_streaming_response`

The above interface eagerly reads the full response body when you make the request, which may not always be what you want.

To stream the response body, use `.with_streaming_response` instead, which requires a context manager and only reads the response body once you call `.read()`, `.text()`, `.json()`, `.iter_bytes()`, `.iter_text()`, `.iter_lines()` or `.parse()`. In the async client, these are async methods.

As such, `.with_streaming_response` methods return a different [`APIResponse`](https://github.com/lithic-com/lithic-python/tree/main/src/lithic/_response.py) object, and the async client returns an [`AsyncAPIResponse`](https://github.com/lithic-com/lithic-python/tree/main/src/lithic/_response.py) object.

```python
with client.cards.with_streaming_response.create(
    type="SINGLE_USE",
) as response:
    print(response.headers.get("X-My-Header"))

for line in response.iter_lines():
        print(line)
```

The context manager is required so that the response will reliably be closed.

### Making custom/undocumented requests

This library is typed for convenient access to the documented API.

If you need to access undocumented endpoints, params, or response properties, the library can still be used.

#### Undocumented endpoints

To make requests to undocumented endpoints, you can make requests using `client.get`, `client.post`, and other
http verbs. Options on the client will be respected (such as retries) when making this request.

```py
import httpx

response = client.post(
    "/foo",
    cast_to=httpx.Response,
    body={"my_param": True},
)

print(response.headers.get("x-foo"))
```

#### Undocumented params

If you want to explicitly send an extra param, you can do so with the `extra_query`, `extra_body`, and `extra_headers` request
options.

#### Undocumented properties

To access undocumented response properties, you can access the extra fields like `response.unknown_prop`. You
can also get all the extra fields on the Pydantic model as a dict with
[`response.model_extra`](https://docs.pydantic.dev/latest/api/base_model/#pydantic.BaseModel.model_extra).

### Configuring the HTTP client

You can directly override the [httpx client](https://www.python-httpx.org/api/#client) to customize it for your use case, including:

- Support for [proxies](https://www.python-httpx.org/advanced/proxies/)
- Custom [transports](https://www.python-httpx.org/advanced/transports/)
- Additional [advanced](https://www.python-httpx.org/advanced/clients/) functionality

```python
import httpx
from lithic import Lithic, DefaultHttpxClient

client = Lithic(
    # Or use the `LITHIC_BASE_URL` env var
    base_url="http://my.test.server.example.com:8083",
    http_client=DefaultHttpxClient(
        proxy="http://my.test.proxy.example.com",
        transport=httpx.HTTPTransport(local_address="0.0.0.0"),
    ),
)
```

You can also customize the client on a per-request basis by using `with_options()`:

```python
client.with_options(http_client=DefaultHttpxClient(...))
```

### Managing HTTP resources

By default the library closes underlying HTTP connections whenever the client is [garbage collected](https://docs.python.org/3/reference/datamodel.html#object.__del__). You can manually close the client using the `.close()` method if desired, or with a context manager that closes when exiting.

```py
from lithic import Lithic

with Lithic() as client:
  # make requests here
  ...

# HTTP client is now closed
```

## Versioning

This package generally follows [SemVer](https://semver.org/spec/v2.0.0.html) conventions, though certain backwards-incompatible changes may be released as minor versions:

1. Changes that only affect static types, without breaking runtime behavior.
2. Changes to library internals which are technically public but not intended or documented for external use. _(Please open a GitHub issue to let us know if you are relying on such internals.)_
3. Changes that we do not expect to impact the vast majority of users in practice.

We take backwards-compatibility seriously and work hard to ensure you can rely on a smooth upgrade experience.

We are keen for your feedback; please open an [issue](https://www.github.com/lithic-com/lithic-python/issues) with questions, bugs, or suggestions.

### Determining the installed version

If you've upgraded to the latest version but aren't seeing any new features you were expecting then your python environment is likely still using an older version.

You can determine the version that is being used at runtime with:

```py
import lithic
print(lithic.__version__)
```

## Requirements

Python 3.9 or higher.

## Contributing

See [the contributing documentation](./CONTRIBUTING.md).

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