Why Payflow calls Rillet its fastest ERP integration ever
Payflow went from first reviewing Rillet’s API docs to a fully live, customer-validated integration in just 10 days. Founder and CEO Wil Eyi called it their “fastest ERP integration ever,” citing clean documentation, predictable responses, and no need for custom SQL or consultants.
Background
Payflow is an AI co-pilot platform for FP&A and strategic finance teams. It analyzes growth and spend effectiveness and powers forecasting and re-forecasting based on real performance, giving finance teams a decision-making partner. By connecting directly to a company’s ERP, Payflow turns raw accounting data into actionable insights and forward-looking forecasts.
The task at hand
In late 2025, Payflow needed to onboard a new mid-market customer doing over $100M in revenue that was running on Rillet. To meet the customer’s timeline, Payflow had to build a robust, production-ready integration to Rillet. And, quickly.
“We originally thought it was going to take us maybe a month to get going on Rillet. We had the initial integration done within five days, and then the next five days were spent on making sure that we had things fully buttoned up.”
Payflow’s team was used to integrating with major ERPs like NetSuite, Sage, QuickBooks where:
- Building the initial integration might take a few weeks, but getting access to all critical data for every entity can easily take 3+ months
- Documentation often diverges from real API responses, especially with multiple entities
- Important data can require learning proprietary query languages
- Teams sometimes need expensive external consultants to access complete data
Payflow went live with Rillet in just 10 days. But the real cost isn’t only time, it’s focus. Multi-quarter integrations (quite common with legacy ERPs) suck up engineering resources, derail roadmaps, and prevent teams from working on their most important projects.
The Rillet difference
Payflow built a direct integration to Rillet’s API to ingest and normalize the customer’s data. Several aspects of Rillet’s platform and team stood out:
Clean, Reliable API & Documentation
- Documentation matched API responses exactly
- Full access to journal entries and their mappings enabled Payflow to rebuild reports cleanly from the ground up
- No proprietary query languages, custom SQL, or expensive consultants were required
High-Touch, Real-Time Partner Support
- Set up a shared Slack channel with Payflow
- Responded to questions same-day, including nights and weekends
- Rillet subject matter experts unblocked edge cases and questions in real time
“Usually you send emails and hope you get a response two days later. And with Rillet, we've had late night chats, weekend chats. We sent a question, responses came in the same night.”
Results
Fully live with Rillet data and customer-confirmed accuracy in just 10 days
Initial integration completed in ~5 days. Spent an additional ~5 days polishing and validating.
Happy Customer, Stronger Partnership
The customer is “very happy” with the setup so far and has confirmed Payflow is correctly ingesting Rillet data.
Faster Time-to-Value for Future Rillet Customers
With the integration in place, Payflow can now onboard new Rillet customers in less than a week. Payflow expects to onboard a handful of Rillet customers in the coming month.
Why this matters to Payflow
Customers rely on our FP&A and strategic finance agent, Luca, to pull key performance insights, run variance analyses and scenario planning, as well as power end-to-end workflows to speed up reporting. Having access to clean, granular and properly reconciled ERP data ensures that they can run real-time analyses with fresh data and drastically cut down decision cycles.
“APIs like Rillet’s allow us to focus more of our time on the intelligence layer, instead of data engineering and data mapping.”
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Learn more about how Payflow can supercharge FP&A and strategic finance with Rillet.
