juspay/decision-engine — Open-source routing system designed for payment processing

Description and use

**Brief summary**
juspay/decision‑engine is an open‑source, Rust‑based routing system that streamlines payment‑processing flows such as billing, checkout, and PSP selection. It provides a configurable decision engine that can evaluate multiple payment‑service‑provider (PSP) options and automate routing logic, helping teams bring monetisation features to market faster.

**Value proposition**
The library abstracts the complexity of multi‑PSP integration, letting developers define routing rules (e.g., cost, latency, success‑rate) in code rather than hard‑wiring them. This reduces the time and effort required to build, test, and iterate on billing or checkout experiences, and it enables rapid experimentation with alternative PSPs without rewriting core business logic.

**Practical adoption path**

1. **Prototype** – Clone the repo and run the example workloads to understand the rule‑definition DSL and the built‑in adapters.
2. **Fit‑gap analysis** – Map the existing payment‑flow signals (order data, user geography, risk scores) to the engine’s input schema; because the metadata in the repository is sparse, a manual review of the code and configuration files is required.
3. **Custom connector development** – Implement thin adapters for your specific PSPs or billing services if the built‑in ones do not match your stack.
4. **Test harness** – Deploy the engine in a sandbox environment, feed it realistic transaction streams, and verify that routing decisions align with business expectations.
5. **Incremental rollout** – Start with a low‑traffic subset of transactions (e.g., internal testing or a pilot region) before expanding to production.

**Production readiness**
The project is at a **medium** readiness level. It has modest community traction (≈115 ★, 34 forks) and recent activity (last update 2026‑05‑14), indicating it is maintained but not yet battle‑tested at large scale. It is suitable for prototypes, internal tools, or staged rollouts, provided you perform the following checks before production use:

• Verify the dependency tree (Rust crates) for security updates and licensing compliance.
• Conduct a thorough integration test to confirm that the engine can ingest your payment signals and invoke the correct PSP adapters.
• Establish monitoring and fallback mechanisms in case the routing logic fails or a PSP becomes unavailable.

If these safeguards are in place, juspay/decision‑engine can be a solid foundation for building flexible, automated payment routing pipelines.

Problem

juspay/decision-engine helps integrate monetization, billing, or PSP flows faster.

Outcome

Medium: useful for prototypes or internal workflows, with dependency and maintenance checks before production.

Workflow

• integrate billing or checkout
• evaluate PSP flows
• automate payment operations

Evidence

open-source routing system designed for payment processing

Source