billing-sdk 0.4.0

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Billing Python Library

The Billing Python library provides convenient access to the Billing API from applications written in the Python language. It includes a pre-defined set of classes for API resources that initialize themselves dynamically from API responses which makes it compatible with a wide range of versions of the Billing API.

Installation

If you just want to use the package, run:

pip install --upgrade billing-sdk

Requirements

• Python 3.8 or higher
• pip (Python package installer)

Configuration

---

Configuring Billing client

from billing import BillingClient

billing_client = BillingClient(
    terminal_id="...",
    terminal_secret_key="tr_sk__...",
)

Choosing Between Sync and Async Clients

You can configure the SDK to use either synchronous or asynchronous requests:

• Synchronous Requests Only:

    billing_client = BillingClient(
        ...
        setup_sync_client=True,
    )
  

• Asynchronous Requests Only:

    billing_client = BillingClient(
        ...
        setup_async_client=True,
    )
  

• Both Synchronous and Asynchronous Requests:

    billing_client = BillingClient(
        ...
        setup_sync_client=True,
        setup_async_client=True,
    )
  

Custom HTTPX client

If you have already initialized an httpx client in your application, you can reuse it in the BillingClient to avoid unnecessary resource allocation:

import httpx
from billing import BillingClient

reusable_sync_client = httpx.Client()

billing_client = BillingClient(
    ...
    sync_client=reusable_sync_client,
)

# and/or

reusable_async_client = httpx.AsyncClient()

billing_client = BillingClient(
    ...
    async_client=reusable_async_client,
)

⚠️ Warning: Ensure that your custom httpx client is not pre-configured with a base_url, headers, or other settings that may cause unexpected errors when making API calls.

Configuring Automatic Retries

Enable automatic retries for transient network errors by setting the max_network_retries parameter:

billing_client = BillingClient(
    ...
    max_network_retries=3,
)

Usage

You can access various API methods through the BillingClient properties. For example, to interact with the Agreement API:

Sync Usage

agreements = billing_client.agreements.list(page_number=1, page_size=20)

Async Usage

agreements = await billing_client.agreements.list_async(page_number=1, page_size=20)

For now Billing SDK support the following API methods:

• Agreement
  • retrieve
  • list
• Feature
  • retrieve_usage_summary
  • list_usage_summary
  • record_usage
• Invoice
  • retrieve
  • list
• Offer
  • cancel
• Order
  • retrieve
  • list
  • create
• Product
  • retrieve
  • list

Webhook Event Construction

When you receive a webhook from Billing, it is highly recommended to verify its Signature to ensure the integrity and authenticity of the event. The Billing SDK provides built-in support for webhook signature verification and event construction, making it easy to validate and process webhooks securely.

Example: Handling Webhooks with FastAPI

Below is an example of how to set up a webhook handler using FastAPI:

from billing import Webhook, SignatureVerificationError
from fastapi import FastAPI, HTTPException, Header, Request, status

# Define your webhook secret key
terminal_webhook_secret_key = "tr_wsk__..."

# Initialize the FastAPI application
app = FastAPI(...)

@app.post("billing/webhook", status_code=status.HTTP_200_OK)
async def handle_billing_webhook(
    request: Request,
    x_billing_signature: str = Header(..., alias="X-Billing-Signature"),
    x_billing_signature_timestamp: str = Header(..., alias="X-Billing-Signature-Timestamp"),
) -> None:
    try:
        # Construct the webhook event with verification
        webhook_event = Webhook.construct_event(
            payload=await request.body(),  # The raw request body as payload
            signature=x_billing_signature,  # The signature from the header
            signature_timestamp=x_billing_signature_timestamp,  # The timestamp from the header
            terminal_webhook_secret_key=terminal_webhook_secret_key,  # Your secret key for verification
        )

        # ###################### Handling logic ######################
        # Process the event here, e.g., logging, updating database, etc.
        print("Received webhook event:", webhook_event)
    except SignatureVerificationError:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Invalid webhook signature"
        )

License

The Billing SDK is licensed under the MIT License. See the LICENSE file for more information.