Billing software for European SaaS: requirements and test cases
What to demand from billing software for the EU market, weighted must and should, and how to test each requirement yourself in a vendor demo.
Blog
Expert articles on EU billing, compliance and SaaS invoicing in the European market.
5 posts on API and architecture. Show all posts
October 2026 2 posts
Choosing an API-based billing platform: what to test in a trial
Sandbox, idempotency keys, RFC 9457 error format, webhook outages, data export: a concrete two-week test plan for choosing a billing API.
August 2026 2 posts
Billing webhooks: signatures, retries, ordering and replay
Signature checks per Standard Webhooks, deduplication by message ID, ordering by object version, and a reconciliation job for missed events.
Billing API for European B2B: what the data model must cover
Tax profile, invoice snapshot, credit note, selling entity: the data objects where generic billing APIs break down in European B2B.
July 2026 1 post
Subscription billing for the EU market: data model and events
An architecture for EU subscription billing: data model, immutable events, the tax decision at invoice creation, and returned debits that actually reach the product.