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Biosus Energy: ERPNext–Xero Accounting Integration
How we built a bidirectional integration between ERPNext and Xero for two group companies — keeping invoices, purchase orders, and contacts in sync automatically.
About the Project
Biosus Energy is an Aberdeen-based renewable energy consultancy. We previously helped them deploy ERPNext in 5 weeks — replacing their fragmented SaaS stack with a unified platform for CRM, projects, and timesheets.
This follow-on project tackled a key gap: Biosus operates two group companies, both using Xero for accounting. They needed invoices, purchase orders, contacts, and payment statuses flowing bidirectionally between ERPNext and Xero — without manual re-entry or reconciliation.
Companies
2
Integrated
Auth
OAuth2
Token refresh
Sync
Real-Time
Webhook-driven
Direction
Bi-Dir
ERPNext ↔ Xero
The Challenge
Two Companies, One Workflow
Biosus operates two group companies, each with its own Xero organisation. Financial documents created in ERPNext needed to land in the correct Xero tenant automatically.
Manual Double-Entry
Staff were manually copying invoices and purchase orders between ERPNext and Xero — wasting hours each week and introducing reconciliation errors.
Payment Visibility Gap
Payments recorded in Xero weren't reflected in ERPNext, so the operations team lacked real-time visibility into which invoices had been paid.
The Solution
We built a custom Frappe app that connects ERPNext to both Xero organisations — syncing financial documents bidirectionally with OAuth2 authentication and webhook-driven updates.
OAuth2 Authentication
Secure OAuth2 connection to each Xero tenant with automatic token refresh — no stored passwords, fully compliant with Xero's API requirements.
Invoice Sync
Sales invoices submitted in ERPNext are automatically pushed to the correct Xero organisation — with line items, tax codes, and contact references mapped accurately.
Purchase Order Sync
Purchase orders flow from ERPNext to Xero, ensuring the accounts team has full visibility of committed spend without manual data entry.
Contact Synchronisation
Customers and suppliers are kept in sync between both systems — creating new contacts in Xero when they're added in ERPNext, and linking existing ones by reference.
Webhook Payment Updates
When payments are recorded against invoices in Xero, webhooks push the payment status back to ERPNext in real time — closing the reconciliation loop.
Multi-Company Routing
Documents are automatically routed to the correct Xero tenant based on the ERPNext company — no manual selection or switching required.
The Results
Zero
Manual data entry between systems
Real-Time
Payment status visibility
2 Tenants
Both companies integrated
Secure
OAuth2 with auto token refresh
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