Sage Accounting API Integration

Sage Business Cloud Accounting has a real REST API — invoices, contacts, payments, ledgers. We build the integrations and automations it was designed for, including the parts Sage left undocumented.

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Invoice & Payment Sync

Create, retrieve and reconcile sales/purchase invoices programmatically — auto-post payments and match them to invoices.

Two-Way Sync

Contacts, products, stock and ledger data kept consistent between Sage Accounting and your other systems.

OAuth & Token Lifecycle

Private or marketplace apps — we handle registration, consent flow, refresh-token rotation and secure credential storage.

Custom Integrations

Sage Accounting to CRM, e-commerce, job systems, field service apps — wherever Zapier's depth runs out.

Middleware & Webhooks

Webhook receivers, event queues, mapping layers and monitoring around the API — integrations that survive edge cases.

Reporting & Exports

Automated extracts — aged debt, VAT figures, transaction listings — pushed to dashboards, spreadsheets or your data warehouse.

Common Builds

✓Order → invoice automation from your website or app
✓Stripe/GoCardless payments auto-posted and reconciled
✓CRM customers synced to Sage contacts with credit terms
✓Nightly ledger/VAT extracts to your reporting stack
✓Field-service jobs → Sage invoices with correct tax treatment
✓Multi-company consolidation across Sage entities

Sage Accounting API FAQ

Does Sage Accounting have a proper API?+

Yes — unlike Sage 50, Sage Business Cloud Accounting has a documented REST API at developer.sage.com: OAuth 2.0, JSON, endpoints for contacts, invoices, payments, products, ledgers and bank transactions. It's a real integration platform, just under-documented in places.

What can you build on the Sage Accounting API?+

Invoice creation and sync, contact/ledger automation, payment posting and reconciliation, product/stock sync, reporting extracts, and bridging to systems with no Sage connector — your CRM, e-commerce, job management or bespoke software.

We have Sage One — is that the same?+

Sage One was rebranded to Sage Business Cloud Accounting (now just 'Sage Accounting'). Same product, same API. If you're on Sage One, everything here applies.

Can you build a private app for just our company?+

Yes — internal OAuth app scoped to your Sage company only, no marketplace listing needed. We handle the app registration, token lifecycle and hosting; you just use the integration.

What are the API's limits?+

Rate limits and some missing endpoints (payroll, some reporting). We work around them with caching, batching and complementary data methods — and we'll tell you upfront if your requirement hits a real gap.

Build on the Sage API

Tell us what Sage Accounting should connect to — we'll map the endpoints and quote the build.

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