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Vendor gawrys
Package counterparty-core
Short Description Framework-agnostic core for counterparty due diligence: domain model, ports, rule-based risk strategy, PSR-18 reference adapters and contract tests.
License MIT

Keywords vat psr vies kyc sanctions due-diligence white-list

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Informations about the package counterparty-core

Counterparty Core

The framework-agnostic heart of the Counterparty Verification toolkit - per-country registry lookups, sanctions screening and a pluggable risk engine for counterparty due diligence. Hexagonal: it depends only on PSR interfaces, so it drops into any framework (or none).

⚠️ This is a due-diligence aid, not a compliance product. It does not make you "AML compliant" - that remains your responsibility. The risk score is advisory.

Features

Hexagonal & dependency-light - PSR-18/17 (HTTP), PSR-16 (cache), PSR-3 (log), PSR-20 (clock). No framework, no vendor SDK in the core.
Capability-aware registries - drivers declare a RegistryCapability; the verifier routes by (country + capability) and returns an honest inconclusive when nothing covers a request. Adding a country is one driver + one registration.
Reference adapters (PSR-18) - PL White List (VAT status, IBAN match, search-id proof), EU VIES, KRS, CEIDG, REGON, CRBR, sanctions.network (default) and OpenSanctions.
Pluggable risk engine - RuleBasedRiskStrategy composed of small RiskRules; add your own without subclassing, or implement RiskStrategy for a bespoke model.
Contract tests as a feature - RegistryDriverContractTestCase certifies any third-party driver.
Strict - PHPStan max + Psalm level 1, fully typed.

Installation

This package is HTTP-client agnostic: it depends on the PSR-18 / PSR-17 interfaces and declares psr/http-client-implementation + psr/http-factory-implementation as virtual requirements, so Composer asks you to choose a client. Install any PSR-18 implementation, e.g.:

Usage

Quick start (auto-wired)

The factory assembles the bundled checks (White List, VIES, sanctions.network) + the rule-based strategy. It auto-discovers your installed PSR-18 client and PSR-17 factories:

Manual wiring (full control)

The clock is optional and defaults to SystemClock; pass a FrozenClock in tests.

Add a country (one driver + one registration)

Add a custom scoring rule

Certify a third-party driver

Full guides live in the documentation.

Part of the toolkit

Package	Purpose
counterparty-core (this)	Domain, registries, risk engine, PSR-18 adapters
counterparty-ai	Optional advisory AI risk research
counterparty-laravel	Laravel bridge
counterparty-bundle	Symfony bundle

Testing

Changelog

See CHANGELOG.md.

Contributing & Security

Pull requests welcome. Please report security issues privately - see SECURITY.md.

Credits

Igor Gawrys

License

The MIT License (MIT). See LICENSE.

All versions of counterparty-core with dependencies

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Package Version

Version v0.1.4 Release 05. Jul 2026
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Requires php Version >=8.2
psr/clock Version ^1.0
psr/http-client Version ^1.0
psr/http-client-implementation Version ^1.0
psr/http-factory Version ^1.0
psr/http-factory-implementation Version ^1.0
psr/http-message Version ^1.1 || ^2.0
psr/simple-cache Version ^2.0 || ^3.0
psr/log Version ^2.0 || ^3.0
php-http/discovery Version ^1.19

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