Vatly Python SDK

Alpha — under active development. Every alpha release may include breaking changes. Pin exact versions during alpha.

Python SDK for Vatly, the European Merchant of Record for AI, software and digital products. Python 3.10+, Pydantic v2 models, and pooled httpx sync/async clients. All 50 production OpenAPI operations are covered.

Installation

pip install vatly-api-python==0.1.0a3

For local development: uv sync --locked.

Quick start

Get a test or live API key from the dashboard, under Settings > API. Keep keys server-side. The client reads VATLY_API_KEY by default.

from vatly import VatlyClient
from vatly.models import CreateCheckoutRequest

with VatlyClient() as vatly:
    checkout = vatly.checkouts.create(
        CreateCheckoutRequest(
            redirect_url_success="https://example.com/success",
            redirect_url_canceled="https://example.com/canceled",
            products=[{"id": "subscription_plan_abc123", "quantity": 1}],
        )
    )
    print(checkout.links.checkout_url.href)

from vatly import AsyncVatlyClient


async def read_orders():
    async with AsyncVatlyClient() as vatly:
        async for order in vatly.orders.list_all({"limit": 100}):
            print(order.id, order.total)

Pydantic models use snake_case attributes and accept Vatly's camelCase aliases. Dictionary inputs use wire-format camelCase keys. Model requests serialize with aliases and omit unset fields; explicitly supplied None is sent as JSON null. Money values remain decimal strings, never floats.

Configuration and reliability

from vatly import VatlyClient, RequestOptions

with VatlyClient(timeout=30, max_retries=2) as vatly:
    page = vatly.customers.list({"limit": 25}, options=RequestOptions(timeout=10))

Timeouts are seconds per httpx network phase per attempt, not a total request deadline; zero disables timeouts. Default base URL: https://api.vatly.com/v1. base_url, default_headers, and transport (an httpx transport) can be overridden. mode exposes test or live. Test helpers reject live keys before sending.

POST/PATCH/PUT/DELETE receive a UUID idempotency key, reused across retries. Set RequestOptions(idempotency_key="your-operation-id") to reuse a business-operation key across separate SDK calls. Set idempotency_key_generator=None to disable auto-keys. GETs and keyed mutations retry 429, 5xx, timeouts and connection errors with exponential backoff (250ms to 8s plus jitter), honoring numeric or HTTP-date Retry-After. Keyed 409 retries only details.idempotency_outcome == "in_progress". Never blindly retry an unknown idempotency outcome: read/reconcile the resource first. Unkeyed mutations do not retry. Redirects are not followed.

Vatly-Client-Info identifies SDK/runtime/OS/architecture. Pass client_info={"app": "MyApp/1.0", "framework": "Django/5"} to add sanitized identifiers, or client_info=False to suppress the SDK-generated header.

Errors

All API/transport errors extend VatlyError, with status, body, url, method, details, errors and retry_after. Network errors retain the httpx exception as __cause__.

from vatly import VatlyClient, VatlyValidationError

with VatlyClient() as vatly:
    try:
        customer = vatly.customers.create({"email": "buyer@example.com"})
    except VatlyValidationError as error:
        print(error.errors)

See getting started and resource guides, the generated method inventory, webhook guide, and production API reference.

Development

Run .agents/setup in a fresh orb. It installs uv if missing, provisions Python 3.12, syncs locked dependencies and runs an import sanity check. Warm runs reuse uv's caches.

uv run python scripts/generate.py --check
uv run ruff check .
uv run ruff format --check .
uv run mypy
uv run pytest
uv build
uv run twine check dist/*

See maintainer notes for spec regeneration, docs sync, and trusted publishing.