openpurse 0.1.4

A lightweight Python package to flatten complex ISO 20022 XML messages into usable data.

OpenPurse

The Ultra-Lightweight ISO 20022 & SWIFT MT Engine for Modern Finance

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⚡️ Why OpenPurse?

Financial messaging is messy. Deeply nested XML (ISO 20022) and archaic block-based formats (SWIFT MT) shouldn't slow down your engineering team. OpenPurse flattens the complexity into clean, structured Python objects.

• 🚀 Performance-First: Built on lxml for lightning-fast parsing.
• 🛡️ Production-Hardened: Handles malformed inputs, Unicode, and huge amounts gracefully.
• 🔌 Context-Aware: Automatically identifies schema versions (770+ ISO namespaces supported).
• 📦 Zero Bloat: No pandas, no pydantic. Just pure, native Python @dataclasses.

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🛠️ Features at a Glance

Feature	Description
Unified Parser	One API for both ISO 20022 XML and SWIFT MT103/MT202/MT940.
Auto-Reconciler	Link initiations, status reports, and notifications into a single lifecycle.
PII Anonymizer	Scrub sensitive data while keeping messages valid (checksum-aware).
Smart Validator	Offline IBAN Modulo-97 and BIC validation.
Translator	Bidirectional conversion between MX and MT formats.
Exporter	Generate OpenAPI 3.0 specs directly from your financial models.

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🏗️ Architecture

graph TD
    A[Raw Message] --> B{OpenPurseParser}
    B -- XML --> C[ISO 20022 Engine]
    B -- Block --> D[SWIFT MT Engine]
    C --> E[PaymentMessage @dataclass]
    D --> E
    E --> F[Validator]
    E --> G[Reconciler]
    E --> H[Translator]
    E --> I[Anonymizer]

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🚀 Quick Start

1. Installation

pip install openpurse

2. Basic Parsing

import openpurse

# Works for both XML and legacy SWIFT MT!
data = b"{1:F01BANKUS33XXX...}{4::20:MSG001...}"
parser = openpurse.OpenPurseParser(data)

# Get a structured, typed object
msg = parser.parse()

print(f"💰 {msg.currency} {msg.amount} from {msg.debtor_name}")

3. Smart Anonymization (Safe for Testing)

from openpurse.anonymizer import Anonymizer

# Scrub PII but keep the IBAN checksums VALID
safe_data = Anonymizer().anonymize_xml(raw_xml_bytes)

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🛡️ Reconciliation Engine

Link a pain.001 initiation to a camt.054 notification with zero sweat.

from openpurse.reconciler import Reconciler

# Build a chronological timeline of a payment's life
timeline = Reconciler.trace_lifecycle(my_seed_msg, all_parsed_messages)

for step in timeline:
    print(f"[{step.__class__.__name__}] {step.message_id}")

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📊 Exporting Models

Need to build a REST API? Export OpenPurse models to OpenAPI in seconds.

./scripts/export_schema.py --output openapi.json

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🧪 Testing and Quality

OpenPurse is verified against 777+ ISO schemas and real-world edge cases.

pytest tests/

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Built with ❤️ for modern financial engineering.