CompanyBelgium: postal mail built into the CRM/ERP through OAuth2

CompanyBelgium, the control panel for Belgian SMEs

CompanyBelgium is an all-in-one CRM/ERP platform built for Belgian businesses. In a single interface it brings together sales management (clients, prospects, pipeline), invoicing (quotes, invoices, contracts, items), accounting (bank, Belgian chart of accounts, financial reports), compliance (AML/KYC, UBO, CTIF, sanctions lists), human resources and a website builder. The goal: let an SME run its entire operation in one place.

But a management platform also produces paper — and that is exactly where Bjet24 comes in.

The challenge: the last mile stays on paper

Even in 2026, part of a company's mail must go out on paper: invoices for clients who do not accept email, payment reminders, formal notices, contractual letters. Letting every user print, fold, frank and carry their letters to the post office broke the "all-in-one" promise: the software stopped at the printer.

Postal sending had to become a feature of the platform, not a chore beside it.

The solution: postal sending connected via OAuth2

CompanyBelgium integrated Bjet24 through OAuth2 authorization. In practice, each business using CompanyBelgium connects its Bjet24 account once, through a consent screen, and authorizes the platform to send mail on its behalf.

That choice has an important consequence: every mailing goes out under the identity and Bjet24 wallet of the business concerned — not under a global account. Billing stays clean, proofs of posting flow back into the right file, and the user keeps control: they can revoke access at any time from their Bjet24 area.

The day-to-day workflow

The most common scenario is the invoice reminder. When an invoice passes its due date, CompanyBelgium generates the reminder PDF and — in one click, or automatically based on defined rules — triggers a mailing through the Bjet24 API. Bjet24 prints, stuffs the envelope, franks it and drops the letter at the post office. The status and proof of posting then come back into the client record, next to the invoice concerned.

The same logic applies to contractual letters and registered mail: the document leaves from the platform and traceability is preserved with no manual handling.

What the integration changed

• No more break between the software and the actual mailing: the letter leaves from the screen where it is created.
• Full traceability: every mailing has a status and a proof archived automatically.
• Fewer missed letters: reminders can be triggered by rule, without depending on a manual task.
• Compliance: proofs of posting and delivery serve as supporting evidence, useful for an SME subject to AML/KYC obligations.

Why OAuth2 rather than a shared API key

CompanyBelgium is a multi-business platform. A single shared API key would have mixed every client's mail under the same account. OAuth2 solves this: each business authorizes Bjet24 individually, its mailings are tied to it, and consent is explicit and revocable. It is the same model large platforms use to connect third-party services — applied here to postal mail.

In summary

For CompanyBelgium, Bjet24 turned postal mail from an external chore into a native feature. Users create an invoice, a reminder or a contractual letter, and the letter goes out — printed, franked, dropped off, tracked. The "all-in-one" now reaches all the way to the recipient's mailbox.