linkbridge (Python SDK)

Official Python client for the Linkbridge e-invoicing API. Mirrors the surface of the Go and Node SDKs against the same OpenAPI contract (tools/openapi/openapi.yaml).

Zero runtime dependencies — uses only the Python standard library so the package drops cleanly into Lambda layers, vendored POS firmware, and air-gapped merchant ERPs.
Sync API with explicit OAuth2 client-credentials handling and automatic token refresh.
Webhook signature verification with constant-time comparison and the same 5-minute clock-skew window enforced server-side.

Install

pip install linkbridge

Requires Python 3.9 or newer.

Quickstart

from linkbridge import LinkbridgeClient

client = LinkbridgeClient(
    base_url="https://api.linkbridge.ng",
    client_id="your-client-id",
    client_secret="your-client-secret",
    scopes=["invoices:write", "invoices:read"],
)

accepted = client.invoices.submit({
    "irn": "INV001-SVC01-20260601",
    "invoice_kind": "Standard",
    # …rest of the canonical NRS payload — see
    # packages/schema/invoice.schema.json
})
print(accepted["irn"], accepted["status"])

# Read back, paginate, retry, mutate payment status:
record   = client.invoices.get(accepted["irn"])
page     = client.invoices.list(limit=20, status="failed")
requeued = client.invoices.transmit(accepted["irn"])
paid     = client.invoices.update_status(accepted["irn"],
              payment_status="PAID", reference="RCPT-001")

Webhook verification

from linkbridge import verify_webhook, SignatureError

@app.post("/hooks/linkbridge")
def hook(request):
    try:
        verify_webhook(
            secret=os.environ["WEBHOOK_SECRET"].encode(),
            body=request.body,                     # raw bytes off the wire
            header=request.headers["X-Linkbridge-Signature"],
        )
    except SignatureError:
        return 401
    # …handle the event

Errors

All non-2xx responses raise linkbridge.APIError, which exposes the HTTP status, the canonical error.code, the human error.message, and the trace_id so that operators can correlate against server logs.

Versioning

The package follows the same 0.MINOR.PATCH cadence as the API surface during the beta. Breaking changes will be confined to MINOR bumps until the API freezes at 1.0.0.

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