Integration Partner · Financial/A/P Automation

Bottomline + Fortress OS

Procure-to-pay for real estate: procurement, PO approval, invoice automation and job costing.

Updated May 16, 2026 · 3 min read

What is the Bottomline + Fortress OS integration?

Bottomline acquired Nexus Systems in 2022, a procure-to-pay platform built for real estate and property management. It covers procurement, purchase order approval, invoice automation and job costing, and its suppliers sit on Bottomline's Paymode-X business payment network.

Key takeaways

Covers the whole cycle from purchase order through to payment.
Job costing is built in, which matters on renovation and capex work.
Suppliers sit on the Paymode-X payment network.

How does Bottomline work with Fortress OS?

Fortress OS sits underneath your stack as the operating layer. When something changes in Bottomline, Fortress picks it up and pushes it to the other systems that care. No double entry. No end-of-month reconciling. No spreadsheets stitching things together.

What data flows between the two?

The exact fields depend on the financial/a/p automation use case. The goal is simple: both systems show the same truth. Records, statuses, and key events stay in sync. Your team is not the human glue between them.

Who handles the setup?

Our integrations team handles documentation exchange, API keys, and end-to-end testing. Most Bottomline connections go live in a few weeks. You can request a setup any time.

Why should you connect Bottomline to Fortress OS?

Procurement and payables live in different systems and argue at month end about what was ordered. One platform holding the purchase order, the invoice and the payment means the job cost on a renovation reflects what you spent.

What changes once you connect Bottomline?

Same financial/a/p automation tool. Different day-to-day for your team.

Daily task	Without the integration	With Fortress OS + Bottomline
Keeping records in sync	Copy-paste between tabs, hope you got the numbers right.	Records match across both systems on their own.
End-of-month reconciling	Spreadsheet exports, manual cleanup, late nights.	Numbers already line up. Close the month, go home.
Onboarding new properties	Manual setup in Bottomline and every other system.	Fortress provisions the connection so new sites pick it up.
Answering “what’s the truth?”	Open three tabs, compare, guess which one is current.	One source of truth, kept fresh by Fortress.

Frequently asked questions

Quick answers about how Bottomline and Fortress OS work together. Don't see your question? Ask us →

Is this the same product as Nexus?

Yes. Bottomline acquired Nexus Systems in 2022. Nexus built its procure-to-pay platform specifically for real estate and property management, and it now sits inside Bottomline.

What does the platform cover?

Procurement, purchase order approval, invoice automation and job costing, so a purchase is tracked from the order through to the payment.

What is Paymode-X?

Bottomline's business payment network, which the Nexus supplier community joined. It is how payments reach your vendors.