How we built an intelligent invoice processing solution on Power Apps

Power Apps has been around for a while, and we keep hearing about what enterprises can achieve with it. But it’s only when you look at how something is built that you understand the benefits, and where it fits into enterprise systems. 

That’s what this blog explores. We are walking through a solution we built in-house on Power Apps, now running for a leading Australian designer and supplier of customized aluminum window and door systems; starting with the business challenges we set out to solve, then moving into how the solution was built and the results it’s delivering.

Power Apps is Microsoft’s platform for building business apps without going through a traditional development cycle. Think of it as a suite of apps, services, connectors, and a data platform, all built to let you create custom apps for your specific business needs. It connects to Microsoft’s own data platform, Dataverse, or to whatever you are already using, whether it’s SharePoint, Microsoft 365, Dynamics 365, or SQL Server. 

Here’s why the platform matters: instead of relying on external developers for a months-long cycle of scoping, staffing, and staging, the people who actually understand the process can build the solution themselves. Despite the minimal code required, these apps deliver deep business logic and seamless mobile or browser integration. 

It’s part of why we have been paying attention to low-code more broadly. We have written before about how low-code solutions are accelerating digital transformation. What’s important to remember is that this technology changes who gets to build enterprise solutions and how fast.  

Power Apps is one of the clearest examples of that shift, and it’s the platform we used here.

Most finance teams processing supplier invoices manually know exactly what this looks like. An invoice comes in by email, someone in finance reviews it, checks it against the purchase order, and keys it into the ERP system by hand. It works, until volume grows.  

Then the challenges crop up: 

• High manual effort on invoice data entry 
• Increased risk of human error and duplicate processing 
• Slow invoice turnaround times 
• Limited visibility into where an invoice is in the process 
• Difficulty tracking exceptions and audit trails 
• Inconsistent handling when validation fails 
• Heavy dependence on a small number of experienced finance staff 

This was the exact position our customer, the Australian aluminum window and door systems designer and supplier we mentioned earlier, found themselves in. Invoice volumes had grown to the point where manual processing was no longer just inconvenient, it was slowing down payments, straining supplier relationships, and making financial governance harder to hold onto.

We built an AP automation solution on Power Apps that combines Optical Character Recognition (OCR), AI, business-rule validation, and ERP integration to handle the invoice lifecycle end-to-end. Rather than just pulling data off a PDF, the solution checks that data against business rules and the customer’s own master data before it ever creates an invoice in their ERP system. 

The result is a workflow that’s consistent, gives finance visibility into where every invoice stands, and keeps manual intervention to the moments that actually need a person, without losing the checks and balances finance teams rely on. 

How it works 

1. Automated invoice intake
   The platform watches a dedicated Accounts Payable inbox and picks up incoming supplier invoices as they arrive, identifying which attachments are ready for processing.
2. Intelligent data extraction
   OCR pulls the invoice details straight off the PDF: supplier information, invoice headers, PO numbers, line items, quantities, pricing, totals.
3. User review and verification
   Extracted data goes to finance for a quick check. They can review, amend, or fill in anything missing before it moves to validation.
4. Business rule validation
   The solution checks each invoice against a set of business rules and ERP master data, including:

• Purchase order verification 
• Supplier validation 
• Duplicate invoice detection 
• Item validation 
• Business data consistency checks 
• Only invoices that clear validation move forward 

These specific checks were built around what this customer needed, the validation logic itself isn’t fixed, and can be configured to whatever rules a business wants to enforce. 

5. Exception management
   Anything that fails the validation process gets flagged and routed for review, so one problem invoice doesn’t hold up the process.
6. ERP integration
   Validated invoices are created directly in the ERP system. No manual entry, and a full trail of how each invoice got there.
7. Operational visibility
   A central dashboard shows finance teams where things stand in real time: what’s processing, what’s stuck, what needs attention, all governed by role-based access so users only see what’s relevant to them.

For our customer, the shift away from manual processing shows up in a few concrete ways: 

• Less manual effort on invoice data entry: Finance no longer keys in every line item by hand. Most of that work happens automatically, and staff step in to review rather than transcribe. 

• Faster turnaround from invoice receipt to ERP entry: Invoices move from inbox to validated ERP record without sitting in someone’s queue waiting to be actioned. 

• Fewer errors and duplicate entries slipping through: Business rule validation catches mismatches and duplicates before they reach the ERP system, instead of finance catching them later. 

• Full visibility into where every invoice stands: The dashboard replaces email chains and status-check requests with a single place to see what’s processed, what’s pending, and what’s stuck in exceptions. 

• A clearer audit trail when compliance needs one: Every invoice carries a traceable record of how it was validated and processed, so answering an audit question doesn’t mean reconstructing the story from memory. 

• A process that can absorb more invoice volume without adding headcount: As the business grows, invoice volume grows with it, and the workflow scales without requiring more people to run it. 

This solution is one example of what’s possible when Power Apps is applied to a specific, well-understood business problem. The same approach, OCR, business rule validation, and ERP integration working together, extends beyond AP automation to other high-volume, rules-based processes that currently rely on manual effort. 

If your finance team is still processing invoices manually, or if you are looking to eliminate repetitive tasks across your business, let us show you how a Power Apps solution can help.