This release is a pre-release and may not be stable for production use.
Polar Python SDK
The official Python client for the Polar API.
Installation
The SDK requires Python 3.11 or later.
uv add polar-sdk
or, with pip:
pip install polar-sdk
Quick Start
Create an organization access token and use the client for the current API version:
from polar.v2026_04 import Polar
polar = Polar("polar_oat_xxx")
customer_state = polar.customers.get_state_external("customer_external_id")
print(customer_state)
The client uses the production environment by default. To use the sandbox, pass
environment="sandbox" when creating the client. Sandbox and production access tokens are
separate.
Keep organization access tokens on the server and never expose them in browser or client-side code.
Webhooks
Use validate_event to verify that a webhook was sent by Polar and parse it into a typed payload
for the selected API version. Pass the raw request body, the request headers, and your webhook
signing secret:
import os
from fastapi import FastAPI, HTTPException, Request
from polar.v2026_04.webhooks import (
PolarWebhookError,
PolarWebhookVerificationError,
validate_event,
)
app = FastAPI()
webhook_secret = os.environ["POLAR_WEBHOOK_SECRET"]
@app.post("/webhooks/polar")
async def polar_webhook(request: Request) -> dict[str, bool]:
try:
event = validate_event(
await request.body(),
dict(request.headers),
webhook_secret,
)
except PolarWebhookVerificationError as exc:
raise HTTPException(status_code=403, detail="Invalid webhook signature") from exc
except PolarWebhookError as exc:
raise HTTPException(status_code=400, detail="Invalid webhook payload") from exc
if event.type == "order.created":
print(event.data.id)
return {"received": True}
The signature is checked before the body is parsed. validate_event raises
PolarWebhookVerificationError for invalid signatures and PolarWebhookUnknownTypeError when the
event is not supported by the selected API version. Both inherit from PolarWebhookError.
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