Polar Python SDK

What it does

When your agent uses it

• Implementing Polar customers and external IDs
• Customer portal sessions
• Customer-state entitlement checks
• Webhook validation and processing

Example prompts

• “/polar-python-sdk”

Requirements

• Python 3
• A credential in POLAR_ACCESS_TOKEN

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Identify the installed polar-sdk version and preserve the API version already selected by the application.
2. 2Inspect generated service signatures, input TypedDict definitions, output dataclasses, and endpoint-specific errors before writing calls.
3. 3Use Polar in synchronous code and PolarAsync in asynchronous code. Do not mix blocking SDK calls into an async request path.
4. 4Identify whether the access token is scoped to an organization. When the selected token does not imply one, create the client with…
5. 5Keep client, webhook, and environment configuration on the server.

What it can do on your machine

Read from SKILL.md and the folder at commit 599c727. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are python).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • POLAR_ACCESS_TOKEN

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Polar Python SDK loads about 1.8k tokens when it runs, and up to ~4.8k if it reads all its reference files. Until then it costs about 103 tokens; SKILL.md has 698 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~103

When it runs · the whole SKILL.md, loaded when a task matches

~1.8k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~4.8k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from polarsource/polar at commit 599c727, republished under its Apache-2.0 licence (© polarsource). 698 words, ~1,832 tokens.

name

polar-python-sdk

description

Integrate Polar billing in server-side Python applications using the versioned Polar and PolarAsync clients. Use when implementing Polar customers and external IDs, checkout or customer portal sessions, customer-state entitlement checks, webhook validation and processing, API error handling, usage-event ingestion and metered billing, or migrating an application from the old Polar Python SDK.

import os

from polar.v2026_10 import Polar

with Polar(
    os.environ["POLAR_ACCESS_TOKEN"],
    environment="sandbox",
) as polar:
    customer_state = polar.customers.get_state_external("usr_123")

import os

from polar.v2026_10 import PolarAsync


async def load_customer_state() -> None:
    async with PolarAsync(os.environ["POLAR_ACCESS_TOKEN"]) as polar:
        customer_state = await polar.customers.get_state_external("usr_123")
        print(customer_state)

customer = polar.customers.create(
    external_id="usr_123",
    email="user@example.com",
)
customer_state = polar.customers.get_state_external("usr_123")

checkout = polar.checkouts.create(
    products=[os.environ["POLAR_PRODUCT_ID"]],
    external_customer_id="usr_123",
    success_url="https://example.com/billing/success?checkout_id={CHECKOUT_ID}",
    return_url="https://example.com/settings/billing",
)
redirect_to(checkout.url)

session = polar.customer_sessions.create(
    external_customer_id="usr_123",
    return_url="https://example.com/settings/billing",
)
redirect_to(session.customer_portal_url)

from polar.v2026_10.outputs import CustomerState


def has_feature_access(customer_state: CustomerState, benefit_id: str) -> bool:
    return any(
        grant.benefit_id == benefit_id for grant in customer_state.granted_benefits
    )


customer_state = polar.customers.get_state_external("usr_123")
set_feature_access(
    customer_external_id="usr_123",
    enabled=has_feature_access(
        customer_state,
        os.environ["POLAR_BENEFIT_ID"],
    ),
)

© polarsource, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 4 other files (references) in sdk/python/polar/.agents/skills/polar-python-sdk of polarsource/polar.

• SKILL.md
• agents/openai.yaml
• references/migration-from-v0.md
• references/usage-events.md
• references/webhooks.md

Open the folder on GitHubat commit 599c727