How Round Treasury Went from Auth Headaches to a One-Day Setup

The Company

Round Treasury is a London-based fintech startup building an AI-powered treasury management platform for businesses. Founded in 2023 by Pac O'Shea and Hayyaan Ahmad, Round unifies treasury, payments, FX, and reconciliation into one intelligent platform — giving growing companies clarity, control, and speed across their money.

Backed by Passion Capital, Tiny VC, and Ascension, the company serves customers primarily in the UK with plans to expand across Europe and the US. Round connects to over 2,000 banks and automates the low-value, repetitive finance work so CFOs and founders can focus on strategy.

The Challenge

Round had built a direct integration with Xero for syncing invoices and payments, but the experience had been painful. Authentication session management with Xero was unreliable — customers would lose their connection and have to re-authenticate, leading to support queries about out-of-sync data and broken workflows.

When enterprise customers started requesting NetSuite and QuickBooks support, the engineering team faced a difficult reality. NetSuite is notoriously complex to build against directly, and Round's team didn't use NetSuite internally. Even getting access to a test instance would have been a project in itself — NetSuite licenses are expensive and difficult to procure for development purposes.

"NetSuite is very difficult to build for directly because we don't use NetSuite. It apparently costs a lot of money," Hassan, Founding Engineer at Round, explained. "We had to find a provider that could give us an instance to test against."

The team evaluated several API aggregation platforms, including Merge.dev and a handful of others. Feature parity between the top contenders was close, but Round needed a provider with deep accounting expertise and — critically — sandbox access for NetSuite.

The Solution

Round chose Apideck's Accounting Unified API after evaluating the market. The deciding factors were Apideck's stronger focus on accounting connectors, the promise of a NetSuite sandbox environment for testing, and competitive pricing compared to alternatives.

The implementation moved fast. Hassan built the initial integration using Xero as the backend connector through Apideck's unified API, with the plan to swap to NetSuite once sandbox access was available. The first production-ready draft was completed in two weeks.

"The simplest part was really the auth, which was very promising," Hassan said. "It's just a very simple front-end integration. That was done in a day, and then I was able to proceed to the rest of the integration."

The Apideck logs feature proved essential during development. Rather than lengthy back-and-forth debugging sessions, Hassan could inspect exactly what the connector was returning, verify parameters, and identify validation issues independently.

"The logs product is very good. It just speeds up development for us because we don't have to do a lot of back and forth. We can just look at the log, see what the issues are, and determine if it's something we did incorrectly."

When issues did arise — particularly around NetSuite's more complex requirements — the Apideck team responded quickly. API changes were shipped fast, keeping Round's development momentum going without extended blockers.

The Results

Round now offers a production NetSuite integration to its customers, unlocking an entirely new segment of the market. While the current user base is still growing, having NetSuite on the feature list has already changed sales conversations.

"It's a huge deal to just have a feature," Hassan noted. "Even if customers don't have an immediate need, it unlocks a lot of new customers for us that we weren't able to target before."

From a development perspective, the time savings were significant. Securing a NetSuite instance alone would have been a substantial task before any code could be written. With Apideck handling the connector complexity and providing sandbox access, Hassan's team could focus on building the product experience rather than wrestling with NetSuite's infrastructure.

The team has plans to migrate their existing Xero integration over to Apideck as well, and QuickBooks is next on the roadmap — further consolidating their accounting stack through a single unified API.