Kissinger API 100: A REST API for Sage 100

Yes. This Sage 100 API supports both read and write operations, allowing external systems to safely create and update records inside Sage 100. Common use cases include creating sales orders, updating customers, adjusting inventory, posting invoices, and synchronizing financial data.

What makes this approach reliable is that all write operations are processed through Sage 100’s native business logic. This ensures validations, calculations, and posting rules are enforced exactly as they would be for a user working inside the ERP. Transactions are handled in a controlled way, reducing the risk of incomplete records, out-of-balance entries, or corrupted data that can occur with database-level writes.

Sage does not provide a native, out-of-the-box REST API for Sage 100. Most integrations rely on Sage's Business Object Interface (BOI), direct database access, ODBC connections, or file imports rather than a true application-level interface, and BOI has no built-in way to notify external systems when something changes, so BOI-based integrations typically rely on scheduled polling rather than real-time updates.

Kissinger API 100 provides REST-based access by wrapping Sage 100 business objects and processes directly, not just exposing database tables, and pushes real-time notifications when data changes instead of requiring external systems to poll on a schedule the way direct BOI integrations do. External systems interact with Sage 100 using standard HTTP methods while the API layer handles validation, transaction control, and version differences. This approach delivers the benefits developers expect from a REST API while preserving the integrity of the ERP.

Kissinger API 100 covers seven core Sage 100 modules: Accounts Payable (AP), Accounts Receivable (AR), Common Information (CI), General Ledger (GL), Inventory Management (IM), Sales Order (SO) and Purchase Order (PO). Within each module, endpoints cover the main master data and transactions, such as customers, vendors, items, sales orders, purchase orders and invoices. Kissinger can add endpoints for custom tables, user-defined fields or other entities on request.

Yes. This API is designed specifically to integrate with Sage 100 safely by enforcing native business rules and validations. Unlike direct database access, which bypasses Sage 100’s application logic, API requests are processed using the same rules that apply to users working inside the system.

This approach helps prevent common integration problems such as incomplete transactions, invalid statuses, posting failures, and data inconsistencies. It also reduces long-term risk by ensuring integrations remain stable and compatible as Sage 100 is upgraded or extended.

ODBC and direct database access interact with Sage 100 at the table level, bypassing application logic, validations, and transactional controls. While this can work for basic reporting, it introduces significant risk when used for operational integrations or write operations.

This Sage 100 API interacts with the ERP through business objects and application processes. That means calculations, dependencies, and posting behavior are handled correctly. The result is more reliable integrations, fewer data issues, and reduced maintenance effort over time — especially for complex or high-volume integrations.

Yes. The API is compatible with all supported versions of Sage 100, including the 64-bit-only Sage 100 2026 release, on-premise or cloud-hosted. Differences between versions are handled within the API layer, so developers do not need to write or maintain version-specific logic in their applications.

This simplifies long-term integration maintenance and reduces the risk that an ERP upgrade will break connected systems. Integrations built on the API remain consistent even as Sage 100 evolves.

Real-time. Kissinger API 100 sends webhook notifications the moment a record is created, updated or deleted in Sage 100, so external systems don’t have to check for changes on a schedule. Reads come from a real-time mirror of your Sage 100 data, which keeps API traffic off your production server. When Sage 100 is online, validation errors on writes come back immediately. If Sage 100 is temporarily offline, writes are queued with a job ID so your system can confirm when each one is applied.

Yes. Kissinger API 100 pushes real-time webhook notifications when key events happen in Sage 100 (such as a new sales order or an inventory change) instead of requiring external systems to poll on a schedule. This reduces integration latency and eliminates the resource overhead of repeated polling jobs.

The API uses secure authentication and encrypted communication to control access to Sage 100 data. Permissions can be scoped to specific objects and actions, helping organizations maintain strong data security and governance.

Visual Integrator, Sage’s built-in import and export tool, works well for scheduled, file-based jobs, such as a nightly order import or a one-time data load. It runs in batches, so it isn’t designed for systems that need to know about changes the moment they happen. An API like Kissinger API 100 fits when another system needs to read and write Sage 100 data on demand, get real-time notifications, or connect over the web. Many companies use both.

Yes. The API is designed for professional developers building custom applications, integrations, or middleware solutions. It provides predictable endpoints, structured responses, and consistent behavior across environments.

When an API request fails, the system returns structured error responses with meaningful status codes and detailed messages. These responses identify validation issues, missing or invalid data, and processing errors within Sage 100.

This allows developers to log errors, surface meaningful feedback to users, and implement retry or exception-handling logic within their integration workflows. Clear error handling is essential for maintaining reliable, automated integrations and reducing troubleshooting time.

Yes. The API is designed to support complex, multi-system integrations that involve high transaction volumes and multiple data flows. This includes eCommerce platforms, EDI providers, CRMs, WMS systems, and custom middleware solutions.

Its architecture supports reliable transaction handling, structured error responses, and integration patterns that scale. This makes it suitable not just for simple data access, but for production-grade integrations where accuracy, performance, and visibility are critical.

Kissinger API 100 is sold as a subscription. Contact us for pricing for your environment.

Kissinger API 100 is developed and supported by Kissinger Associates, Inc., which has built Sage 100 integrations and enhancements since 1989, first as a Sage 100 Master Developer and now as a Sage Tech Partner. API 100 was built natively around Sage 100’s architecture, and the team that develops it also supports our customers and partners.