E-Invoicing integrationwith national tax authorities.
We integrate your invoicing and business systems with national e-invoicing platforms — enabling real-time invoice submission, compliance reporting, and audit-ready records across multiple jurisdictions simultaneously.
This is a specialist capability. Most development firms have no experience with tax authority API integrations. Zornixa has delivered this in production across two African jurisdictions.
Integration architecture: Business system ↔ ZRA / TRA e-invoicing APIs
How we deliver a
compliant integration.
Requirements & specification review
We start by obtaining and thoroughly reading the relevant tax authority's technical specification document — which is often hundreds of pages, complex, and poorly documented. We ask the right questions up front.
Sandbox integration & API testing
We build against the authority's sandbox environment first — validating every invoice type, error code, retry mechanism, and edge case before touching production. No shortcuts.
Client system integration
We connect your invoicing or ERP system to the authority API — whether via middleware, a direct SDK, or a webhook-based architecture — designed for your specific stack.
Compliance certification & production
We support you through the authority's certification process — preparing test submissions, coordinating with their technical team, and managing the production go-live.
Monitoring & ongoing support
Tax authority APIs change. We monitor your integration, alert you to specification updates, and maintain the connection — so you stay compliant without managing it yourself.
Authority coverage
Zambia Revenue Authority
Tanzania Revenue Authority
Kenya Revenue Authority
Nigeria FIRS e-Invoice
What we handle
- Real-time invoice submission
- Credit note & debit note compliance
- Error handling & retry logic
- Digital signature & QR code generation
- Audit log & reporting
- Multi-currency support
- Batch submission for historical data
Dual-jurisdiction integration:
ZRA + TRA, live in 10 weeks.
A fintech client required their invoicing platform to submit in real time to both the Zambia Revenue Authority (ZRA) and Tanzania Revenue Authority (TRA) — two different API specifications, two certification processes, one codebase.
Challenge
Divergent API specifications, strict uptime SLAs, and a client invoice volume requiring robust error handling and retry logic.
Approach
Built a unified compliance middleware layer that normalised both specifications behind a single interface, with per-jurisdiction routing and error mapping.
Outcome
Production-live across both jurisdictions within 10 weeks. Zero compliance failures post-launch. Full audit log retained per specification.
2
Jurisdictions
10 wks
To production
100%
Compliance rate
Client name anonymised pending approval. Full case study available under NDA.
Need to integrate with a tax authority API?
We are one of the very few teams with production-grade e-invoicing integration experience. If you are facing a compliance deadline, start the conversation early.