API & Systems Integration

What we connect

Common integrations

Who it is for

Ways of working

One order, every system, no re-keying

A single web order in a growing UK business can touch the storefront, a marketplace, the warehouse or 3PL, a carrier, the accounting package, the CRM and the returns process. When any two of those are joined by a person and a spreadsheet, stock goes wrong, customers are told the wrong thing and month end takes a week.

We design the order as one flow: captured once, stock reserved, picked and despatched with a carrier label, tracking sent to the customer, invoice posted to the accounts with the right VAT, the customer record updated, and returns handled back through the same path. Each step is monitored and any failure is retried or raised.

Supplying the supermarkets over EDI

Winning a listing with a major retailer usually comes with an EDI requirement: orders, acknowledgements, despatch advices and invoices in the retailer’s specified format, over their chosen network, with barcodes and delivery windows enforced. Suppliers who handle this manually pay in chargebacks and staff time.

We connect EDI to the ERP so retailer orders arrive as orders, despatch generates the advice and labels the retailer requires, invoices go back electronically, and disputes can be matched to the delivery record. Each retailer group is onboarded and tested against its own specification.

An API in front of the system that has none

Many UK businesses run on a system that still does the job but was never designed to be connected: an older ERP, a bespoke database, a desktop application, a supplier that only accepts spreadsheets. Replacing it is expensive and disruptive; leaving it isolated keeps the re-keying.

We build a service in front of it, reading and writing its database or files safely, exposing a clean API the rest of the business can use, and monitoring it like any other integration. The old system keeps running and the business gets the connections it needs.

Integrations that cannot fail silently

A connection that stops working and tells nobody is the most expensive kind. Orders stop posting, stock drifts, invoices are missed, and the error surfaces weeks later as a customer complaint or a wrong VAT return. Most integrations we replace had no monitoring at all.

Every integration we ship is idempotent so retries never duplicate, retries transient failures automatically, logs every message, alerts a named person when something needs attention, and is documented so the next developer understands it. Managed integrations cover keeping them working as the connected systems change their APIs.

Making Tax Digital through the accounting package, not around it

Making Tax Digital requires VAT records to be kept digitally and submitted through compatible software, with digital links between the systems that hold the figures. An operational system that exports a spreadsheet for someone to re-key into the accounting package breaks the digital link and creates the errors HMRC penalises.

We integrate operational systems to Xero, Sage or QuickBooks so every sale and purchase posts with the correct VAT treatment, the digital link is preserved end to end, and the return is submitted from the accounting package through its HMRC-recognised connection. Where a business needs direct HMRC API access, we build and register it.

API & Systems Integration in our other markets

Infynix Solutions is registered separately in India, the United Kingdom and the United Arab Emirates. This page covers United Kingdom. The same service, written for the other markets:

• API & Systems Integration in United Arab Emirates