What is OSCU in KRA eTIMS
The OSCU (Online Sales Control Unit) is a component of Kenya Revenue Authority’s Electronic Tax Invoice Management System (eTIMS). It allows online invoicing systems to integrate directly with KRA via an API instead of relying on manual portal entry.
OSCU is designed specifically for systems that operate fully online, such as:
- Cloud POS platforms
- e-commerce systems
- SaaS billing solutions
Key Highlights
-
System-to-system integration
OSCU enables your ERP, POS, or billing platform to exchange invoice data with KRA in real time. -
Automation & compliance
It ensures invoices are issued, validated, and stored according to KRA regulations. -
Ideal for always-online systems
Particularly suited for cloud-based solutions without offline workflows. -
Certification required
Integrators and vendors typically undergo a KRA certification process before production use.
🛠️ What OSCU Integration Actually Does
When integrating with OSCU, your application will:
-
Authenticate and establish a session
Connect securely to the eTIMS OSCU API. -
Submit tax invoice data
Send sales details, tax breakdowns, buyer information, etc. -
Receive confirmation & digital signatures
KRA validates and signs the invoice data. -
Store/log the signed invoice
Save validated invoice metadata for printing and audit trails.
This exchange is real-time and must follow strict payload schemas defined by KRA.
📦 Paybill’s OSCU SDKs — What They Are
The Paybill OSCU SDKs (available for PHP, JavaScript/TypeScript, and Python) are community-maintained developer libraries that simplify interaction with the OSCU API.
Instead of building:
- Raw HTTP requests
- Token refresh logic
- Schema validation layers
…developers can rely on pre-built abstractions.
What the SDKs Provide
✅ Simplified API method calls
✅ Built-in payload validation
✅ Automatic token management
✅ Sandbox & production support
✅ Consistent structure across languages
⚠️ Important: These SDKs are intended strictly for OSCU integrations, not VSCU or portal workflows.
🧩 Supported Programming Languages & Installation
| Language | Installation | Package | GitHub |
|---|---|---|---|
| PHP | composer require paybilldev/kra-etims-sdk | Packagist | github.com/paybillke/kra-etims-php-sdk |
| JavaScript / TypeScript | npm install @paybilldev/kra-etims-sdk yarn add @paybilldev/kra-etims-sdk | npm | github.com/paybillke/kra-etims-js-sdk |
| Python | pip install kra-etims-sdk | PyPI | github.com/paybillke/kra-etims-python-sdk |
These SDKs align with the official KRA OSCU Postman specifications, reducing integration errors.
📊 What the SDKs Handle for You
Using the SDKs removes much of the repetitive complexity:
-
🔁 Token lifecycle management
Automatic caching and refreshing of session tokens. -
📐 Payload compliance checks
Ensures required fields and formats match KRA expectations. -
🧭 Consistent developer experience
Similar method naming across PHP, JS, and Python. -
🚨 Early error detection
Validation errors appear before requests reach KRA. -
🧪 Sandbox support
Safe testing before live deployment.
This allows developers to focus on business logic rather than protocol mechanics.
📌 Practical Uses of OSCU Integration
OSCU integration is ideal for:
- Cloud POS systems
- Online billing platforms
- E-commerce checkout systems
- Accounting & ERP solutions
- Middleware connecting sales systems to KRA
These integrations eliminate manual invoice entry and improve compliance accuracy.
⚠️ Things to Watch Out For
Even with SDK assistance, developers should plan for:
- 📍 Strict validation rules
- ⏳ Token/session expiry
- 🔄 Possible KRA API updates
- 🧪 Sandbox vs production differences
- 📜 Certification requirements
Always:
✔ Test thoroughly in sandbox
✔ Validate data before submission
✔ Monitor KRA specification changes
📌 Broader eTIMS Context
OSCU is just one integration pathway within eTIMS. Other options include:
- Online portal invoicing
- eTIMS client applications
- Virtual Sales Control Unit (VSCU)
Each solution serves different operational needs depending on connectivity, scale, and system design.