Open Banking API Integration for Enterprise Treasury Management Systems

Treasury management systems sit at the centre of enterprise finance — managing cash positions, payments, bank accounts, and liquidity decisions every single day. But even the strongest TMS can only work as fast as the bank data it receives.

And that’s where most treasury teams get stuck.

Treasury teams don’t fall behind because their TMS is outdated.
They fall behind because their bank data arrives too slowly.

Delayed balance updates, missing intraday movements, and manual bank portal downloads all limit how effectively the TMS can support daily decision-making. The system itself isn’t the issue — the connectivity layer beneath it is.

Open Banking APIs change this. They give enterprises real-time access to their UK bank accounts, allowing treasury management systems to operate with current cash positions instead of yesterday’s files.

This guide explains how UK enterprises can enhance their existing TMS with Open Banking connectivity and how Finexer helps treasury, finance systems, and ERP teams unlock real-time data without replacing the tools they already use.

Why Treasury Management Systems Still Struggle With Bank Data

Treasury management systems are built to centralise cash, automate payments, and simplify liquidity control. But even with the right TMS in place, most teams still deal with the same underlying issue: bank data that doesn’t arrive when they need it.

Here’s the core problem treasury teams face:

1. Bank feeds still run on batch cycles

Most UK banks provide balance and transaction data only a few times per day. If cash moves between those cycles, your TMS won’t see it until much later which affects forecasting, risk decisions, and short-term investments.

2. Multi-bank treasury = inconsistent formats

Every bank delivers data differently. Some send files. Some require portal downloads. Some offer partial intraday visibility. Your TMS ends up stitching those inputs together instead of working with clean, unified data.

3. Manual reconciliation never fully disappears

Even with a TMS, teams still spend time checking portals, exporting movements, or verifying large-value transactions. The lag forces treasury to “fix” the data manually when the system can’t update fast enough.

4. Payment workflows rely on outdated rails

Many treasury systems still operate alongside SFTP files, host-to-host setups, or manual uploads. This slows down payments, increases operational risk, and makes exception handling harder.

In short:

Your TMS is not the cause of the delays. The bank data layer beneath it is.

This is the exact layer Open Banking replaces — giving your TMS direct, API-based access to real-time balances, movements, and payment status updates.

Practical Use Cases: What Treasury Management Systems Can Do With Open Banking

Once Open Banking feeds real-time data into your treasury management system, the impact shows up immediately in day-to-day operations. Here are the practical scenarios where finance teams see the biggest gains:

1. Real-time cash visibility across all UK accounts

Treasury management systems traditionally rely on delayed bank feeds, which means cash positions are always a few hours or a full day behind.
With Open Banking APIs, your TMS receives updated balances and new transactions as they occur.
This helps treasury teams make faster decisions around funding, cash allocation, and short-term investments.

2. Better liquidity control during peak movement hours

When intraday movements hit — supplier runs, payroll, high-value receipts — a treasury system needs live data to avoid unexpected shortfalls or unnecessary borrowing.
Open Banking gives your TMS up-to-date visibility so you can act before liquidity pressure builds.

3. Faster reconciliation for high-volume transaction flows

For enterprises managing multiple UK accounts and daily payment streams, reconciliation remains one of the most time-consuming tasks.
API-delivered transaction data arrives cleaner and more frequently, allowing treasury management systems to match payments and receipts without waiting for batch files.

4. Smoother payment workflows

Some enterprise treasuries use Open Banking to initiate account-to-account payments directly from their treasury system.
This reduces reliance on file uploads or portal-based approvals and provides real-time confirmation for payments that matter.

5. Stronger internal controls and auditability

API-driven data comes with clear timestamps, consent logs, and event-level tracking. This helps treasury teams maintain tighter oversight across their bank accounts and align TMS records with internal compliance frameworks.

How Finexer Integrates With Your Treasury System

Finexer doesn’t replace your existing treasury setup, It improves the bank connectivity layer that powers it.

Here’s how the integration works in practice:

1. One API for all your UK bank accounts

Instead of managing separate feeds, formats, and portals, Finexer provides a single Open Banking connection covering 99% of UK banks.
Your TMS (treasury management system) gets consistent data without the IT overhead of multiple bank-by-bank integrations.

2. Real-time access to accounts, balances, and transactions

Finexer’s AIS endpoints deliver live updates across all connected accounts.
Your system no longer waits for delayed files — it operates on current information.

3. Optional payment initiation for treasury workflows

If your workflows include funding movements, internal transfers, or payout cycles, Finexer’s PIS layer can trigger account-to-account payments directly from your existing process.
This replaces slow file uploads and reduces manual approvals.

4. Clean, standardised data your system can use instantly

Finexer normalises merchant names, references, and transaction details across banks.
This cuts down on the manual clean-up treasury teams typically perform when formats don’t match.

5. Strong governance built into the API

Consent management, access rights, and activity logs are all handled at the API layer.
Finance, treasury, and audit teams get clear oversight without adding new governance tasks inside the TMS.

6. Fast deployment without changing your system

Finexer integrates with in-house treasury tools, and most ERPs.
There’s no system replacement — you simply enhance what you already use with real-time Open Banking connectivity.

7. 3–5 weeks of hands-on onboarding support

Your team receives guided support across sandbox testing, integration setup, and production rollout. This helps organisations go live 2–3x faster than typical Open Banking deployments.

How Sysynkt Improved Its Banking Layer With Finexer

Sysynkt, a business automation platform serving high-profile clients, needed an Open Banking partner that understood business workflows — not consumer-centric models. Most major TPPs prioritised consent volume, which didn’t align with Sysynkt’s focus on delivering accurate, high-quality financial data.

As their Chief Commercial Officer put it: “Our business isn’t about the volume of consents — it’s about delivering high-quality services to some of the biggest names in the industry.”

Finexer solved this by providing business-focused Open Banking connectivity, clean UK bank data, and the flexibility Sysynkt needed to support complex automation flows. The partnership stood out because of its collaborative nature.

“Finexer’s willingness to work closely with us, rather than treating us as just another customer, was truly refreshing.”

For treasury teams, the lesson is clear: if Finexer can support a complex platform like Sysynkt with tailored, business-grade connectivity, the same model can strengthen any enterprise’s treasury setup without changing the core system they already use.