How GCPay Integrates With Your Construction ERP
If your ERP is the system of record for contracts and financials, the first question about any payment application platform is simple: will it connect without requiring a custom build your team then has to maintain?
GCPay integrates with major construction ERPs including Sage, Viewpoint Vista, CMiC, and Acumatica through pre-built connections that we build and maintain. Where a direct ERP connector isn’t available, GCPay can connect through Procore Project Financials. Contract and project data flows from your ERP into GCPay, while approved payment applications flow back for accounts payable, keeping both systems aligned to the same contract values.
This guide explains how GCPay’s integration model works, which systems it connects to, how data moves between them, and what that connection means for the accuracy of your payment records.
What systems does GCPay integrate with?
GCPay integrates directly with four construction ERPs, Sage, Viewpoint Vista, CMiC, and Acumatica. Where your ERP has no direct connector, we connect through Procore Project Financials instead, so you run the same payment workflow either way.
| System | Type | How the integration works |
| Sage 300 CRE, Sage 100 Contractor, Sage Intacct Construction | ERP — direct connector | Link a GCPay project to a Sage project, import contract values and pay terms, and export approved applications for payment back to Sage for AP |
| Viewpoint Vista | ERP — direct connector | Commitment management, automated payable imports, and instant project validation, keeping project reports and financials current |
| CMiC | ERP — direct connector | Link a GCPay project to an existing CMiC project, pull project details and contract values, and export approved applications for payment to CMiC |
| Acumatica | ERP — direct connector | Commitment management and automated payable imports, with subcontractor compliance enforced at pay app submission |
| Procore Project Financials | Project financials — bridge | Push projects, commitments, and change orders into GCPay and pull approved pay apps back, where an ERP has no direct connector |
Our connection to Sage runs deepest. We have worked with Sage for more than 15 years, our first customer was a Sage 300 CRE user, and we are now part of Sage’s construction product portfolio.
How the managed-connector model works
We build the connection to each supported ERP, maintain it, and update it as the ERP evolves. Each managed connector runs on the ERP’s own API, giving GCPay a direct, maintained path into the system.
These connectors are built around the construction finance data GCPay needs to exchange, including projects, contracts, change orders, compliance documents, and payment applications. Where a direct ERP connector isn’t available, Procore Project Financials provides the bridge between systems.
The value of this model becomes clearest when your ERP changes. Because we own and maintain the connector, a Sage or Vista upgrade doesn’t become a new integration project for your team. In 2025, for example, we updated the Sage 300 integration by moving more of its settings and functionality into GCPay and reducing the component that runs on a customer’s local server. Customers received that change through an update we rolled out, without having to rebuild the integration themselves.
The integration carries different data each way, as each system owns a different part of the record.
Your ERP holds the contract. From it, we pull the data that defines what a subcontractor can bill against: projects, contract values, pay terms, commitments, change orders, and compliance documents with their expiration dates. When you link a project, those details come into GCPay, so each payment application is built against the ERP’s own contract record rather than a separate copy of it.
GCPay holds the payment workflow. Once an application for payment is reviewed and approved, it goes back to the ERP for accounts payable. On the Sage 300 integration, you select the approved applications and export them as a batch, so what returns to your system of record is a set of approved figures you have already signed off on, not a live feed you have to police.
The effect is a single contract record on both sides. The pay app is built from ERP data, and the approved application returns to the ERP, so the numbers in each system describe the same billing rather than two versions of it that someone has to reconcile.
How the connection is set up
How you connect depends on whether your ERP has a direct connector or comes in through Procore.
With a direct connector, you set the link up inside GCPay. For example, with Sage 300, you can create a project in GCPay, choose to link it through the integration, and select the matching Sage project, which pulls its details in. From the Integration tab you link the contracts, and from there you export approved applications for payment back to Sage. The 2025 Sage 300 update moved these settings and functions into the GCPay platform and reduced the component running on the server that hosts Sage 300. Where that server component still applies, we install the current version in a short session with access to the Sage host.
If your ERP has no direct connector, you connect through Procore Project Financials. Projects, commitments, and change orders push from Procore into GCPay, and approved pay apps pull back into Procore, so you run the same payment workflow without a direct link to the ERP.
How the integration keeps your payment data accurate
Accuracy is determined at two points: the point of data entry and checks against it.
Every value that crosses the integration is one no one re-keys. Contract values, change orders, and pay terms come from your ERP rather than being typed a second time into GCPay, which removes the transcription errors that appear whenever the same number is entered in two places.
The connection also lets GCPay check a submission against the ERP’s record. Because the contract values and approved change orders originate in your ERP, a pay app that bills against a figure the contract does not support can be caught in review rather than after payment. Compliance documents carry their expiration dates across, so approval can be held when a required document has lapsed. Between them, these checks close the gaps that manual, disconnected billing leaves open: overbilling and math errors, unapproved change orders, missing lien waivers, double entry, and expired compliance documents.
BNBuilders, a general contractor on the Acumatica integration, described its effect on their operations. In the words of Program Manager Desiree Albano, “Our processing time for subcontractor accounting has gone from 5 days a month to less than a day. The ERP integration was one of the biggest selling points for us. GCPay will be like ‘hey, these don’t match!’ and give us the opportunity to fix it.”
Built to run alongside the systems you already have
GCPay connects to your system of record, takes contract data from it, and returns approved payment applications to it, placing GCPay inside your finance stack as the payment layer between your ERP and your subcontractors. In this way, the ERP stays authoritative for contracts and financials, and the subcontractor payment workflow runs against that same record rather than beside it.
Better still, as part of Sage’s construction product portfolio and an Autodesk company, we build and maintain the connectors to Sage, Viewpoint Vista, CMiC, and Acumatica ourselves, so they keep working as those systems change.
See how the GCPay integration connects to your ERP in a technical walkthrough.
Frequently Asked Questions
Does GCPay integrate with Sage?
Yes. GCPay integrates with Sage 300 Construction and Real Estate, Sage 100 Contractor, and Sage Intacct Construction. The relationship is long-standing: GCPay has worked with Sage for more than 15 years, GCPay’s first customer was a Sage 300 CRE user, and GCPay is part of Sage’s construction product portfolio. The integration links a GCPay project to a Sage project, imports contract values and pay terms, and exports approved applications for payment back to Sage for accounts payable.
Does GCPay integrate with Viewpoint Vista, CMiC, and Acumatica?
Yes, each through a direct connector. The Viewpoint Vista integration handles commitment management, automated payable imports, and project validation. The CMiC integration links a GCPay project to an existing CMiC project, pulls in project details and contract values, and exports approved applications for payment. The Acumatica integration manages commitments and payable imports and enforces subcontractor compliance requirements at pay app submission.
Does GCPay work with Procore?
Yes, through Procore Project Financials. Procore is a project management and financials platform rather than an ERP, and GCPay uses it as a bridge for general contractors whose ERP has no direct connector. Projects, commitments, and change orders push from Procore into GCPay, and approved payment applications pull back into Procore, so the general contractor runs the same payment workflow without a direct ERP link.
Does GCPay replace our ERP?
No. GCPay is a payment application platform, not an ERP or accounting system. Your ERP remains the system of record for contracts and financials, and GCPay adds the subcontractor payment workflow on top: pay applications, lien waivers, compliance tracking, and export of approved payments back to the ERP.
Do we have to build the GCPay integration ourselves?
No. GCPay provides the integrations to its supported ERPs and maintains them, including updating them as the ERP changes, so your IT team does not build or own the connection. For a system without a direct connector, GCPay integrates through Procore Project Financials. Setup for a direct connector is handled inside GCPay, and where a server component applies, as with Sage 300, GCPay installs it.