The Challenge: Replacing a Complex, Costly iPaaS Integration, Fast

As Bill.com’s customer base rapidly expanded, its commercially available iPaaS integration began to show its limits. What once worked for a smaller footprint had become cumbersome, expensive, and increasingly difficult to maintain, especially as customers demanded richer AP, AR, payments, and treasury workflows inside NetSuite.

To continue scaling, Bill.com needed a fully native SuiteApp—one that could replicate (and eventually surpass) their legacy integration, support thousands of customers, and meet Oracle NetSuite’s rigorous certification requirements. And they needed to do it in under six months.

Bill.com partnered with ExtendApps to reimagine the integration from the ground up, consolidate years of functionality into an efficient, modern SuiteApp, and ensure a seamless migration path for 3,000+ existing NetSuite customers.

ExtendApps assembled a dedicated team to work shoulder-to-shoulder with Bill.com’s product and engineering leaders. Together, we:

Defined and Rationalized Functionality

ExtendApps audited the legacy iPaaS integration—spanning AP, AR, payments, vendor management, treasury functions, and more—and translated its capabilities into a unified SuiteApp architecture aligned with NetSuite best practices.

Designed a Future-Proof SuiteApp

We built a scalable, extensible SuiteApp able to support:

• High-volume transaction syncing

• Payment initiation and reconciliation

• Bi-directional vendor, invoice, and customer flows

• Treasury and accounting use cases with strong controls

• Flexible configuration for thousands of NetSuite tenants

Every component was engineered for reliability, performance, and long-term maintainability.

Executed a Complex Migration Strategy

With 3,000+ customers relying on Bill.com’s existing integration, migration quality was critical. ExtendApps:

• Identified which code paths could be safely reused, accelerating delivery

• Defined and executed a tenant-level migration plan

• Ensured data continuity across thousands of accounts

• Built fallback and exception-handling routines to protect customer operations

  
  

• Delivered + Certified the SuiteApp on an Aggressive Timeline

ExtendApps guided Bill.com through the full SDN and BFN certification processes, ensuring the SuiteApp met Oracle NetSuite’s security, performance, and reliability standards—clearing the path to publish and scale in the NetSuite ecosystem.

How We Did It

• Designed, built, and launched a full-featured Bill.com SuiteApp in < 6 months

• Mapped and modernized Bill.com’s broad AP/AR/payments/treasury functionality into a high-performing native SuiteApp

• Created a migration plan for 3,000+ live NetSuite customers, minimizing disruption and ensuring data consistency

• Assumed support for the SuiteApp, handling customer onboarding, support workflows, incident resolution, and technical guidance

• Delivered continuous enhancements, including monthly feature releases to maintain full product parity

• Enabled new functionality, such as SuiteTax support, product acquisition integrations, and performance optimizations

• Partnered on long-term strategic planning, helping Bill.com scale its NetSuite offering with minimal internal staffing

The Results

ExtendApps provided end-to-end delivery, support, and ongoing evolution of Bill.com’s SuiteApp—dramatically improving performance, scalability, and customer experience across the NetSuite ecosystem.

Impact Highlights

• Supported thousands of NetSuite customers with a lean internal Bill.com team, reducing operational cost

• Resolved 1,000+ customer inquiries, improving stability and customer satisfaction

• Delivered 40+ feature releases, ensuring continuous product parity and enhancement

• Helped Bill.com expand from ~3,000 to 5,000+ NetSuite customers during the engagement

• Established a scalable, long-term SuiteApp foundation positioned for continued growth