FlexPrice Python SDK

Type-safe Python client for the FlexPrice API: billing, metering, and subscription management for SaaS and usage-based products.

Requirements

Python 3.10+

Installation

pip install flexprice

With uv or poetry:

uv add flexprice
# or
poetry add flexprice

Runnable samples are in the examples/ directory.

Environment

Variable	Required	Description
`FLEXPRICE_API_KEY`	Yes	API key
`FLEXPRICE_API_HOST`	Optional	Full base URL including `https://` and `/v1` (default: `https://us.api.flexprice.io/v1`). No trailing slash.

Integration tests in api/tests/python/test_sdk.py use a different env shape; see api/tests/README.md.

Quick start

Initialize the client, create a customer, ingest an event:

import os
from flexprice import Flexprice

api_key = os.getenv("FLEXPRICE_API_KEY", "YOUR_API_KEY")
server_url = os.getenv(
    "FLEXPRICE_API_HOST", "https://us.api.flexprice.io/v1"
)

with Flexprice(server_url=server_url, api_key_auth=api_key) as client:
    external_id = "customer-123"
    client.customers.create_customer(
        external_id=external_id,
        email="user@example.com",
        name="Example Customer",
    )
    result = client.events.ingest_event(
        request={
            "event_name": "Sample Event",
            "external_customer_id": external_id,
            "properties": {"source": "python_app", "environment": "test"},
            "source": "python_app",
        }
    )
    print(result)

Async usage

The same client supports async when used as an async context manager:

import asyncio
import os
from flexprice import Flexprice

async def main():
    server_url = os.getenv(
        "FLEXPRICE_API_HOST", "https://us.api.flexprice.io/v1"
    )
    async with Flexprice(
        server_url=server_url,
        api_key_auth=os.getenv("FLEXPRICE_API_KEY", "YOUR_API_KEY"),
    ) as client:
        result = await client.events.ingest_event_async(
            request={
                "event_name": "Sample Event",
                "external_customer_id": "customer-123",
                "properties": {"source": "python_async", "environment": "test"},
                "source": "python_async",
            }
        )
        print(result)

asyncio.run(main())

Authentication

Pass your API key as api_key_auth when creating the client. The SDK sends it in the x-api-key header.
Set FLEXPRICE_API_HOST to a full URL (see Environment) or use the default https://us.api.flexprice.io/v1.
Prefer environment variables; get keys from your FlexPrice dashboard or docs.

Error handling

API errors are raised as exceptions. Catch them and inspect the response as needed:

try:
    with Flexprice(server_url="...", api_key_auth="...") as flexprice:
        result = flexprice.events.ingest_event(request={...})
except Exception as e:
    print(f"Error: {e}")
    # Inspect status code and body if available on the exception

See the API docs for error formats and status codes.

Features

Full API coverage (customers, plans, events, invoices, payments, entitlements, etc.)
Sync and async support
Type-safe request/response models (Pydantic)
Built-in retries and error handling

For a full list of operations, see the API reference and the examples in this repo.

Troubleshooting

Missing or invalid API key: Ensure api_key_auth is set (or set FLEXPRICE_API_KEY and pass it in). Keys are for server-side use only.
Wrong server URL: Use a full URL such as https://us.api.flexprice.io/v1 (include /v1; no trailing slash).
4xx/5xx on ingest: Event ingest returns 202 Accepted; for errors, check request fields (event_name, external_customer_id, properties, source) against the API docs.

Handling Webhooks

Flexprice sends webhook events to your server for async updates on payments, invoices, subscriptions, wallets, and more.

Flow:

Register your endpoint URL in the Flexprice dashboard
Receive POST with raw JSON body
Read event_type to route
Parse payload into typed model
Handle business logic idempotently
Return 200 quickly

import json
from flexprice.models import (
    WebhookDtoPaymentWebhookPayload,
    WebhookDtoSubscriptionWebhookPayload,
    WebhookDtoInvoiceWebhookPayload,
)

def handle_webhook(raw_body: str) -> None:
    event = json.loads(raw_body)

    match event.get("event_type"):
        case "payment.success" | "payment.failed" | "payment.updated":
            payload = WebhookDtoPaymentWebhookPayload.model_validate(event)
            if payload.payment:
                print(f"payment {payload.payment.id}")
                # TODO: update payment record

        case "subscription.activated" | "subscription.cancelled" | "subscription.updated":
            payload = WebhookDtoSubscriptionWebhookPayload.model_validate(event)
            if payload.subscription:
                print(f"subscription {payload.subscription.id}")

        case "invoice.update.finalized" | "invoice.payment.overdue":
            payload = WebhookDtoInvoiceWebhookPayload.model_validate(event)
            if payload.invoice:
                print(f"invoice {payload.invoice.id}")

        case _:
            print(f"unhandled event: {event.get('event_type')}")

Event types

Category	Events
Payment	`payment.created` · `payment.updated` · `payment.success` · `payment.failed` · `payment.pending`
Invoice	`invoice.create.drafted` · `invoice.update` · `invoice.update.finalized` · `invoice.update.payment` · `invoice.update.voided` · `invoice.payment.overdue` · `invoice.communication.triggered`
Subscription	`subscription.created` · `subscription.draft.created` · `subscription.activated` · `subscription.updated` · `subscription.paused` · `subscription.resumed` · `subscription.cancelled` · `subscription.renewal.due`
Subscription Phase	`subscription.phase.created` · `subscription.phase.updated` · `subscription.phase.deleted`
Customer	`customer.created` · `customer.updated` · `customer.deleted`
Wallet	`wallet.created` · `wallet.updated` · `wallet.terminated` · `wallet.transaction.created` · `wallet.transaction.updated` · `wallet.credit_balance.dropped` · `wallet.credit_balance.recovered` · `wallet.ongoing_balance.dropped` · `wallet.ongoing_balance.recovered` · `wallet.ongoing_balance.updated`
Feature / Entitlement	`feature.created` · `feature.updated` · `feature.deleted` · `feature.wallet_balance.alert` · `entitlement.created` · `entitlement.updated` · `entitlement.deleted`
Credit Note	`credit_note.created` · `credit_note.updated`

Production rules:

Keep handlers idempotent — Flexprice retries on non-2xx
Return 200 for unknown event types — prevents unnecessary retries
Do heavy processing async — respond fast, queue the work

Documentation

FlexPrice API documentation
Python SDK examples in this repo
SDK integration tests — different FLEXPRICE_API_HOST shape for automated tests

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