Financial messaging infrastructure with real production gravity.
jPOS is the Java-centric platform behind gateways, switches, acquirers, and issuers that need standards compliance, operational control, and room to build serious payment systems.
- ISO-8583, ISO-20022, EMV, and ANS X9.24 support
- Open-source core with enterprise extensions and support
- Purpose-built for high-integrity transaction processing
Production-grade building blocks for payment systems.
Composable components for message routing and transaction orchestration.
Self-serve when you can, bring in the core team when you need to.
The protocol coverage institutions need for interoperability across rails.
This is what jPOS looks like.
A few lines of Java to parse and answer an ISO-8583 message, and a small XML descriptor that Q2 hot-deploys as a production channel. No code generation, no vendor console.
- ISO-8583 in Java
- Deploy with Q2
// Parse an inbound ISO-8583 authorization request
ISOMsg m = new ISOMsg();
m.setPackager(new ISO87APackager());
m.unpack(request);
// Approve it
m.setResponseMTI();
m.set(39, "00");
byte[] response = m.pack();
<!-- deploy/10_channel.xml — drop it in, Q2 hot-deploys it -->
<channel-adaptor name="acquirer-link"
class="org.jpos.q2.iso.ChannelAdaptor" logger="Q2">
<channel class="org.jpos.iso.channel.NACChannel"
packager="org.jpos.iso.packager.ISO87APackager">
<property name="host" value="192.168.1.1" />
<property name="port" value="7001" />
</channel>
<in>acquirer-send</in>
<out>acquirer-receive</out>
<reconnect-delay>10000</reconnect-delay>
</channel-adaptor>
Different paths, one payment-grade core.
Whether you are evaluating the framework, learning its moving parts, or planning a commercial deployment, pick the path that gets you there fastest.
Start Building
Explore the open-source stack, transaction manager, packagers, channels, and the practical path to your first message flow.
Open the docsLearn jPOS
Go from framework basics to production patterns with tutorials, guides, and the institutional knowledge behind the project.
Follow the tutorialSecret Source
Bring in the core team for commercial licensing, advanced modules, architecture guidance, and production support.
Explore enterprise optionsBuilt for institutions that care about the details of the wire.
The value proposition is not “another Java toolkit.” It is a battle-tested set of primitives for payment systems where message semantics, processing flow, and operational visibility need to stay under your control.
See the framework overviewPayment Standards
Built around ISO-8583, ISO-20022, EMV, and ANS X9.24 for institutions that need interoperability, not abstractions.
Operationally Proven
Designed for gateways, acquirers, issuers, and switches where transaction integrity, visibility, and throughput matter.
Composable Core
Use Q2, TransactionManager, channels, MUXes, and packagers as a toolkit instead of buying into a rigid platform.
From zero to a working system in three steps.
Everything is open source: set up a local environment, run the components, and build a real message flow the same day.
Understand the landscape
Start with the overview of jPOS projects and how the open-source and enterprise pieces fit together.
Open sectionSet up a working environment
Use the tutorial track to get a local setup, understand the directory structure, and run your first components.
Open sectionImplement a real flow
Jump into the tutorials for channels, transaction manager, packagers, QMUX, and related building blocks.
Open sectionWhat the project has been shipping.
Releases, engineering notes, and announcements from the jPOS team.
From Latest to Locked: Pinning jPOS SNAPSHOTs
The jPOS Gradle Plugin now lists, pins, and restores SNAPSHOT versions in a version catalog, making the path from current development builds to reproducible QA and production builds explicit and reversible.
Read updateJuly 21, 2026jPOS Control Plane Notifications: The System Comes to the Operator
This demo shows how the jPOS Control Plane routes operational events to the right people through the in-app inbox, live notification bell, email, and webhook channels—while keeping delivery configuration and its audit trail under control.
Read updateJuly 8, 2026jPOS Transaction Log Inspector: Explain with AI
This demo shows the jPOS Control Plane explaining payment transactions in plain language while preserving tenant scope, masking sensitive data, and recording every read in the transaction access-audit trail.
Read updateBring the core team into the room.
When you need architecture guidance, premium modules, or support for a production rollout, the commercial side of the ecosystem is part of the story.