Local Marketplaces
- Digitec
- Galaxus
- Brack.ch
- Ricardo
- Tutti.ch
- microspot.ch
- Manor
- Conrad CH
- Amazon.de
- Zalando
- Etsy
- Temu
Swiss Custom Software: Abacus, Bexio, Sage 50 CH Integration and Swiss QR-Bill API
Swiss accounting and ERP is dominated by local players — unlike many international markets, the Abacus + Bexio + Sage 50 CH triad holds over 70% share. For international software providers the practical question is: how do you cleanly integrate with the customer's existing Abacus or Bexio installation? This guide covers Swiss QR-Bill API generation, the eBill SIX network, ZUGFeRD DACH compatibility and revDSG data protection in custom software architecture.
CH Accounting + ERP Landscape
| Software | Target | API | QR-Bill | Annual Licence |
|---|---|---|---|---|
| Abacus | SME to Enterprise | REST + OData | Native | CHF 2,500-20,000 |
| Bexio | Micro-SME | REST | Native | CHF 348-1,068 |
| Sage 50 CH | SME | SDK/COM | Native | CHF 800-3,500 |
| Banana Buchhaltung | Micro | CSV/JSON | Native | CHF 99-189 |
| SwissSalary (NAV/BC) | Enterprise | OData | Module | CHF 1,800+/user |
Bexio Integration: Open API for Micro-SME
Bexio (a subsidiary of insurer Mobiliar) ships an open, modern REST API: /v2/contact, /v2/invoice, /v2/article, /v2/kb_invoice endpoints make catalogue, customer and invoice sync straightforward. OAuth2 authentication, 30 req/sec rate limit. Common e-commerce integration patterns: create customer + invoice in Bexio at order placement, auto-generate Swiss QR-Bill, mark "bezahlt" when payment lands.
Abacus Integration: Mid-Market and Enterprise
Abacus (a family business headquartered in Wittenbach-St.Gallen) is the backbone of the mid-market segment. With modules like AbaImmo, AbaProject, AbaSalary, AbaWeb and integration via REST + OData v4, it runs in SaaS (AbaCloud) or on-premise mode. For an international software vendor: Abacus Solution Partner certification is effectively mandatory for customer trust; the process takes 3-6 months.
Swiss QR-Bill API: Generation and Validation
Swiss QR-Bill generation follows ISO 20022. Open-source libraries: swissqrbill (Node.js, npm), codeitnow/swiss-qr-bill (PHP), Codecrete/SwissQRBill (.NET), nicoulaj/swiss-qr-bill (Java). The pipeline: IBAN validation → QR-IBAN conversion (for CH recipients) → 27-digit creditor reference → optional ISO 11649 creditor reference → SVG/PDF render. SIX Group offers an official validator API for downstream checks.
eBill via SIX: The Electronic Invoice Network
eBill is the electronic invoice network operated by SIX Group and shared by all major Swiss banks — when a customer chooses "eBill" the bill drops directly into their online banking, payable in one click. Over 3 million active eBill users exist in Switzerland. Integration takes one of two paths: direct SIX onboarding (long, direct commercial relationship) or via an eBill service provider (PostFinance, Abacus and Bexio operate as providers themselves).
ZUGFeRD and Cross-Border DACH
ZUGFeRD (the German hybrid XML+PDF electronic invoice format) matters for Swiss companies doing B2B with Germany. Paired with France's Factur-X profile, ZUGFeRD 2.x sees wide DACH acceptance. Custom software architecture: Swiss QR-Bill + embedded ZUGFeRD XML inside one PDF, so the same document serves CH banking (QR) and DE ERP (XML) — dual-capability single artefact.
revDSG: Data Protection and Architecture Decisions
In custom software revDSG compliance is an architecture decision: data minimisation applied per endpoint, encryption at rest and in transit baseline, audit log as evidence in EDÖB inspections. For cross-border transfers (e.g. dev/staging in Türkiye) Standard Contractual Clauses plus the Swiss SCC amendments are required; sector regulators like BAFU may tighten data residency further.
Sage 50 CH and SwissSalary: Classic and Enterprise Payroll
Sage 50 CH (formerly Sage Schweiz, on-premise classic accounting + payroll) remains widespread in small and mid-sized Swiss companies. Integration is via SDK/COM objects — no modern REST — so the practical pattern is a middleware service (NestJS or .NET) controlling Sage's COM objects. On the payroll side SwissSalary (built on Microsoft Dynamics NAV/BC) is the enterprise standard, with modern OData v4 integration. The module's core job is correctly computing AHV, BVG, UVG and KTG employer/employee contributions.
Swiss-Domestic Cloud: Infomaniak, Exoscale, Hidora
For revDSG-sensitive projects a Swiss-domestic cloud provider is preferable. Infomaniak (Geneva/Zürich, Public Cloud + S3-compatible Object Storage), Exoscale (Lausanne, KVM + Kubernetes), Hidora (Geneva, Jelastic PaaS) and cyon (Basel, shared + VPS) are the main players. AWS Frankfurt or Azure Switzerland North are viable but invite additional data-residency audit evidence.
Zunapro Custom Software Approach
For Swiss customers Zunapro delivers a Node.js (NestJS) + PostgreSQL + Redis backbone with Swiss QR-Bill generator, Bexio/Abacus/Sage connectors, ZUGFeRD generator, eBill SIX adapter, revDSG-compliant audit log and Infomaniak or Exoscale (Swiss-domestic cloud) hosting. Typical enterprise integration: 10-16 weeks, price band CHF 35,000 - 120,000.