AP Invoice API for Sage300

By | October 30, 2025

Sage 300 is a widely used ERP system that supports financial management, operations, and reporting. One of the most critical functions in Sage 300 is Accounts Payable (AP) Invoice Entry. Traditionally, this process involves manual data entry, which can be time-consuming and prone to errors. However, with API integration, businesses can automate invoice entry and streamline their accounts payable process.

New Stuff :- Enhancing Order Confirmation with Deliver By Date in Sage 300

In this blog we will discuss about newly developed API and how an AP Invoice can be created automatically in Sage 300 using APIs.

In the first screenshot, an API request is sent to:

The request body is structured in JSON format and includes all the necessary invoice details such as database name, vendor number, document number, document type, and more. It also contains AP Invoice Details, which define line items along with the HSN code and the respective amounts.

This ensures that both header and line-level details are properly passed to Sage 300.

Please refer the below screenshot

Fig 1: JSON Parameters

After sending the request is submitted, the API responds with a confirmation that the invoice has been created successfully. This confirmation verifies that the document is recorded in Sage 300 without requiring any manual entry.

Fig 2: Confirmation Status

The second screenshot displays the same invoice within the Sage 300 A/P Invoice Entry screen. The invoice details match those provided in the JSON request, and the system has accurately created the batch entry, with the total and distribution details reflecting the data submitted through the API.(As shown below)

Fig 3: AP Invoice Entry

The AP Invoice API for Sage 300 enables organizations to move towards fully automated, integrated, and paperless accounts payable operations. this API ensures that your financial data flows seamlessly and securely into Sage 300.

About Us:-

Greytrix – a globally recognized and one of the oldest Sage Gold Development Partner is a one-stop solution provider for Sage ERP and Sage CRM organizational needs. Being acknowledged and rewarded for multi-man years of experience, we bring complete end-to-end assistance for your technical consultations, product customization, data migration, system integration’s, third party add-on development and implementation competence.

Greytrix offers unique GUMU™ integrated solutions of  Sage 300 with Sage CRM, Salesforce.com, Dynamics 365 CRM and MagentoeCommerce along with Sage 300 Migration from Sage 50 US, Sage 50 CA, Sage PRO, QuickBooks, Sage Business Vision and Sage Business Works. We also offer best-in-class Sage 300 customization and development services and integration services for applications such as POS | WMS | Payroll | Shipping System | Business Intelligence | eCommerce for Sage 300 ERP and for Sage 300c development services we offer, upgrades of older codes and screens to new web screens, latest integration’s using Data and web services to Sage business partners, end users and Sage PSG worldwide. Greytrix offers 20+ addons for Sage 300 to enhance productivity such as GreyMatrixDocument AttachmentDocument NumberingAuto-Bank ReconciliationPurchase Approval SystemThree way PO matchingBill of Lading and VAT for Middle East. The GUMU™ integration for Dynamics 365 CRM – Sage ERP is listed on Microsoft Appsource with easy implementation package.

For more details on Sage 300 and Sage 300c Services, please contact us at accpac@greytrix.com, We will like to hear from you.