Avenryx SystemsService
API integration services for UK businesses
Integration is easy to demo and hard to operate. The value is not in the first successful call; it is in what happens at 02:00 when the third-party API returns a 500 and nobody is watching.
Outcomes
- One record entered once, everywhere it is needed
- Failures visible and retried instead of silently lost
- Nightly CSV imports retired
- Reconciliation reports that prove the data agrees
Service
Where it is used
ERP to storefront
Prices, stock and orders synchronised both ways.
CRM to finance
One customer record from first contact to paid invoice.
Partner EDI
Trading partner formats translated into your own model.
What we deliver
- Integration architecture and message design
- REST, GraphQL, SOAP, EDI and file-based transports
- Idempotency, retries and dead-letter handling
- Monitoring dashboards and alerting
- Reconciliation and data-quality reporting
Who this is for
- Companies running several good systems that do not share data
- Teams rekeying the same record into two or three places every day
- Businesses whose partners or marketplaces require a data feed they cannot currently produce
When this is the wrong choice
- One-off data moves — a scripted migration is cheaper than an integration platform
- Cases where the upstream vendor will not provide any access route at all
Problems this solves
Double entry
Sales enters the order, finance enters it again, the warehouse enters it a third time. Each pass adds a chance to differ.
Silent failures
Nightly file jobs fail quietly and nobody notices until stock is wrong. Integrations need a visible queue and alerts.
Stale data on decisions
Reports built on yesterday's export drive today's purchasing. Near-real-time sync changes what management can act on.
Architecture and integration
- Idempotent operations so a retry cannot create a duplicate order.
- Dead-letter queue with human-readable errors and a one-click replay, not a log file nobody opens.
- Field-level ownership rules — one system is authoritative per field, always.
- Backoff and rate-limit handling matched to each provider's documented limits.
How delivery runs
- 01
System and field mapping
Every system, every field, every direction, and the rule for who wins a conflict — written down before code.
- 02
Contract and sandbox setup
We confirm rate limits, sandbox availability and authentication early, because these are where timelines slip.
- 03
Build with replay
Every message is stored, so a failed batch can be replayed after a fix rather than rebuilt by hand.
- 04
Cutover and monitoring
Dashboard for queue depth, failures and latency, with alerting to a channel someone actually reads.
Realistic timeline
Week 1
Mapping, access, sandbox verification.
Weeks 2–5
Build, replay tooling, error handling.
Weeks 5–7
Parallel run against live data, then cutover.
What moves the price
Quality of the other end
A modern documented API is quick. SOAP, flat files or screen scraping against a legacy host is not.
Direction and conflict
One-way sync is far simpler than two-way with conflicting edits.
Volume
Thousands of records a day need batching, throttling and monitoring that a few dozen do not.
Where projects go wrong
No sandbox
Testing against production is how duplicate invoices get created. We insist on a test environment or a safe simulation.
Undocumented edge records
Ten years of odd records break naive mappings. We profile the real data before writing rules.
Nobody owns the queue
An integration without an owner degrades quietly. Handover includes who watches what.
What is different in this market
Systems we see most in the UK
Sage, Xero, Shopify, Salesforce, Microsoft Dynamics and long-standing on-premise systems with file-based interfaces are the common integration set in UK mid-market operations.
UK GDPR and data residency
Personal data can be hosted in UK or EU regions, with a records-of-processing entry, retention rules implemented in the system and DPIA support where the processing warrants it.
Indicative budget
Cost scales with the number of systems and the quality of their APIs.
FAQ
Questions buyers ask
Our ERP has no API. Now what?+
Database-level, file-based or screen-level integration are all viable. We pick the least fragile route the vendor allows.
Do we need middleware?+
Sometimes. For two or three systems, direct integration is usually cheaper to own.
You already have the idea. Let's define what comes next.
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