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Practical writing on connecting business systems: platform-specific guides, integration patterns that hold up in production, and the mistakes that make projects overrun. Written by the engineers who deliver the work.
Integration patterns · Featured
Why two-way sync fails, and the four conflict rules that fix it
Most bidirectional integrations are built as two one-way flows pointed at each other. That works until both systems change the same record in the same minute. Here is how to decide which side wins, and how to prove it afterwards.
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Project delivery
Integration handover documentation: the pack that lets your own team take over
A working interface is only half the deliverable. The other half is the pack that lets a named person inside your business restore service, rotate a credential and change a mapping without calling the people who built it.
Project delivery
Integration acceptance testing against real order edge cases
Most order integrations pass their tests and then fail in week one. The difference is whether the test set was invented by the build team or drawn from twelve months of your own awkward orders.
Project delivery
What an Integration Discovery Phase Should Actually Produce: The Pack You Sign Against
Discovery is not a conversation; it is a set of documents. Here is the pack an integration discovery phase should hand over, what each artefact contains, and how a finance or operations manager can audit it before signing.
Project delivery
Fixed scope integration: writing the acceptance test before the build
A fixed price only holds if both sides agree in advance what finished looks like. Writing the acceptance test before any code exists turns a vague brief into a measurable contract, and removes most of the arguments that occur at go-live.
Accounting & finance
Discount mapping accounting integration: bundles, promotions and a ledger that still balances
Promotions, multi-buys and bundles rarely arrive from a sales channel in a shape the ledger understands. This article sets out how to allocate, apportion and post them so the invoice total, the VAT and the margin report all agree.
Accounting & finance
What “correctly coded” means when an order becomes an invoice
When finance says the invoices are wrong, they rarely mean the totals. They mean the postings landed in the wrong place. This is what correct coding requires, and how to prove it before go-live.