How Redbus Enabled Fast B2B EInvoicing with APIFirst Middleware for Internet Brands

About the Client

Redbus is a global digital platform for bus ticketing, operating in India, Malaysia, Singapore, Indonesia, and LATAM markets. In Malaysia, Redbus generates B2B invoices, which posed unique challenges for LHDN e-invoicing compliance.

• Entity Type: Global Digital Platform (Tech-Led)
• Integration Type: Direct B2B
• Market: Primarily online and mobile-driven, API-native

Problem

1. Custom Billing Architecture: Unlike off-the-shelf ERPs, Redbus had a proprietary system for invoice generation—making schema alignment and compliance mapping a non-trivial task.
2. B2B Invoice Compliance: Redbus needed to issue e-invoices to its corporate partners and affiliates in Malaysia while aligning with LHDN’s strict JSON schema and validations.
3. Real-Time Submission Expectations: As a digital-first company, Redbus expected the compliance layer to match its API-first architecture and minimal-latency expectations.
4. Validation Complexity: Redbus handled multi-party settlements and dynamic tax handling based on invoice jurisdiction, requiring robust logic and validation mapping.

Solution

1. API-Native Middleware:
   Complyance integrated into Redbus’ custom billing platform using REST APIs, enabling real-time conversion of internal invoice formats into LHDN-compliant JSON payloads.
2. Custom Adapter Layer:
   Built a lightweight adapter between Redbus’ internal invoice structure and LHDN requirements, covering:
   • Tax breakdowns
   • Buyer and seller TRN mapping
   • Invoice type, supply type, and document classification
3. Validation & Monitoring Stack:
   • Deployed pre-submission auto-validation for all outgoing invoices
   • Reconciliation tools to track successful, failed, and retried invoices
   • Provided async webhooks for status updates
4. Minimal Disruption Deployment:
   Enabled the compliance layer to operate without refactoring Redbus’ existing billing code—speeding up go-live while maintaining audit integrity.

Impact

• Go-Live in < 3 Weeks using internal dev team and Complyance APIs
• Full LHDN Compliance without changing internal invoice logic
• Devs Empowered – Self-serve tools, documentation, and sandbox for Redbus’ internal team
• Scalable Architecture to reuse in other Southeast Asian markets adopting e-invoicing