# What Is System Integration? Types, Methods, Examples

> System integration connects applications and data so they can exchange information. Learn the types, methods, API, webhook, ETL, examples, and challenges.

**URL:** https://www.ciptadusa.com/blog/integrasi-sistem-adalah  
**Type:** blog  
**Author:** PT Cipta Dua Saudara  
**Category:** Engineering  
**Published:** 2026-10-23  
**Cover:** https://www.ciptadusa.com/media/uploads/blog/2026-10/1792722099228-integrasi-sistem-adalah-20261023.webp  

## Article

System integration is the process of connecting two or more different applications, databases, or data sources so they can exchange data and work as one. Jitterbit defines it as connecting disparate systems, applications, and data sources so that they become part of a single, unified ecosystem, which makes it possible to share information efficiently and automate processes ([source](https://www.jitterbit.com/blog/what-is-system-integration/)).

A simple example: when an order comes into an online store, stock in the warehouse system drops right away, an invoice is created in the accounting system, and the sales team sees the customer's purchase history in the CRM, without anyone copying data from one application to another. This article covers what system integration means, its types, the methods and technologies involved (API, webhook, middleware, ETL), business examples, common challenges, and how to plan an integration project.

## What Is System Integration?

In the book Enterprise Integration Patterns, Gregor Hohpe and Bobby Woolf describe enterprise integration as the task of making separate applications work together to produce a unified set of functionality ([source](https://www.enterpriseintegrationpatterns.com/patterns/messaging/IntegrationStylesIntro.html)). They also explain why it is hard: some applications are built in-house while others are bought from vendors, they run on different platforms, some are run by business partners, and some were never designed for integration and cannot be changed.

So system integration does not mean replacing every application with one new piece of software. Integration lets each application keep doing its job, then builds paths for data and processes to flow between them.

### What Is Information System Integration?

Information system integration is system integration applied to business applications such as [ERP](https://www.ciptadusa.com/en/blog/erp-adalah), [CRM](https://www.ciptadusa.com/en/blog/crm-adalah), [HRIS](https://www.ciptadusa.com/en/blog/hris-adalah), point of sale, e-commerce, and [SaaS](https://www.ciptadusa.com/en/blog/saas-adalah) apps. The goal is to keep customer, product, stock, transaction, and employee data consistent across every application that uses it.

## Goals and Benefits of System Integration

System integration solves the problems that appear when data is scattered across many applications. Benefits you can expect:

- **Less repeated data entry.** Data is entered once in its source system, then sent to other systems automatically.
- **More consistent data.** Customer names, prices, and stock levels do not differ between applications because they come from one source.
- **Automated cross-team processes.** Jitterbit notes that integration makes it possible to share information efficiently and automate processes ([source](https://www.jitterbit.com/blog/what-is-system-integration/)).
- **Reports from a single view.** Data from web analytics, CRM, and e-commerce can be combined in one dashboard, the example Jitterbit uses to explain data integration ([source](https://www.jitterbit.com/blog/what-is-system-integration/)).
- **Existing systems stay in use.** Applications that still work well do not have to be thrown away just because the company adds new ones.

These benefits only show up when the integration is designed and monitored properly. The challenges section below covers what to plan for.

## Types of System Integration

System integration can be grouped by what is being connected. The grouping below summarizes Jitterbit and Kaseya ([source](https://www.jitterbit.com/blog/what-is-system-integration/), [source](https://www.kaseya.com/blog/system-integration/)):

| Type | What is connected | Example |
| --- | --- | --- |
| Data integration | Data from many sources combined into one view | A sales dashboard pulling data from CRM and e-commerce |
| Application integration (EAI) | Business applications exchange data and trigger processes | Online store orders flow into the ERP automatically |
| Legacy system integration | Older or on-premise systems with modern systems | Desktop accounting software connected to a new web app |
| Cloud integration | Cloud apps with other cloud apps or on-premise systems | A SaaS HRIS connected to an internal payroll server |
| B2B integration | Processes between a company and its partners, suppliers, or customers | Purchase orders sent automatically to a supplier's system |
| EDI | Exchange of business documents between companies in a standard format | Electronic invoices and purchase orders |

Kaseya describes EDI as the intercompany exchange of business documents in a standardized format, replacing paper documents such as invoices or purchase orders ([source](https://www.kaseya.com/blog/system-integration/)).

## Integration Styles: Four Basic Approaches

Enterprise Integration Patterns sums up four main application integration styles ([source](https://www.enterpriseintegrationpatterns.com/patterns/messaging/IntegrationStylesIntro.html)):

1. **File transfer.** Each application produces files with data other applications need, such as a daily CSV export. The challenge is the file format, because one application's output may not match what another needs, so processing is required ([source](https://www.enterpriseintegrationpatterns.com/patterns/messaging/FileTransferIntegration.html)).
2. **Shared database.** Several applications store shared data in one common database. The data stays consistent, but designing a schema that suits many applications is very difficult ([source](https://www.enterpriseintegrationpatterns.com/patterns/messaging/SharedDataBaseIntegration.html)).
3. **Remote procedure invocation.** An application exposes certain functions that others can call, for example through an API. Each application protects its own data, but the applications remain fairly tightly coupled ([source](https://www.enterpriseintegrationpatterns.com/patterns/messaging/EncapsulatedSynchronousIntegration.html)).
4. **Messaging.** Applications exchange messages asynchronously through a common messaging system, so the sender and receiver do not have to be up at the same time ([source](https://www.enterpriseintegrationpatterns.com/patterns/messaging/Messaging.html)).

Hohpe and Woolf stress that no single style fits every need. Two applications can use several styles at once, picking the one that suits each integration point ([source](https://www.enterpriseintegrationpatterns.com/patterns/messaging/IntegrationStylesIntro.html)).

## System Integration Methods (Topologies)

Besides style, integration also differs by how the connections are shaped. Kaseya and BigCommerce describe the following methods ([source](https://www.kaseya.com/blog/system-integration/), [source](https://www.bigcommerce.com/articles/business-management/systems-integration/)):

- **Point-to-point.** One system connects directly to another for a single business function. Fine for narrow needs, but hard to manage as the number of systems grows.
- **Star (spaghetti).** Each subsystem connects to other subsystems through many point-to-point links. Complexity rises as systems are added.
- **Hub-and-spoke.** Every system connects to one central hub that acts as an intermediary, so data senders and receivers are decoupled.
- **Vertical.** Systems are connected per function in "silos", for example only finance systems linked together. Simple, but rigid.
- **Horizontal (ESB).** All subsystems connect to one shared layer called an enterprise service bus. IBM defines an ESB as an architectural pattern whereby a centralized software component performs integrations between applications ([source](https://www.ibm.com/think/topics/esb)).
- **Common data format.** All systems agree on one shared data format, so there is no need for a separate translator for every pair of systems.

### Illustration: Why Point-to-Point Grows Fast

The calculation below is a mathematical illustration, not project data. If every system connects directly to every other system, the number of connections is n × (n − 1) ÷ 2, where n is the number of systems.

| Number of systems | Connections if all are linked directly | Connections through one hub |
| --- | --- | --- |
| 3 | 3 | 3 |
| 5 | 10 | 5 |
| 8 | 28 | 8 |

Table assumptions: each pair of systems needs one two-way connection, and the hub model needs one connection per system. In practice not every system needs to talk to every other one, but the pattern shows why companies with many applications consider a hub, middleware, or an ESB.

## Technologies Used in System Integration

### API

API stands for Application Programming Interface. AWS describes APIs as mechanisms that enable two software components to communicate using a set of definitions and protocols, where the interface can be thought of as a contract of service between two applications ([source](https://aws.amazon.com/what-is/api/)). In integration, APIs are used to read or send data to another application on demand, such as creating a new order in the ERP from an online store.

### Webhook

Webhooks let a system subscribe to events in another piece of software and automatically receive a delivery of data to its server when those events occur. According to GitHub Docs, webhooks are used to receive data as it happens, as opposed to polling an API by calling it intermittently to see if data is available ([source](https://docs.github.com/en/webhooks/about-webhooks)). For example, a payment gateway sends a webhook to your system when a payment succeeds, and the system marks the order as paid.

### Middleware and iPaaS

AWS defines middleware as software that different applications use to communicate with each other, acting as a bridge between diverse technologies, tools, and databases ([source](https://aws.amazon.com/what-is/middleware/)). Integration platform as a service (iPaaS) is integration middleware delivered as a cloud service.

### ETL

ETL (extract, transform, load) extracts raw data from multiple sources, transforms and consolidates it in a staging area, then loads it into a target store such as a data warehouse ([source](https://aws.amazon.com/what-is/etl/)). AWS describes three extraction approaches: update notifications from the source system, incremental extraction of data changed within a period, and full extraction for systems that cannot flag changes. ETL suits reporting and analytics, not processes that must happen the moment an event occurs.

### Quick Comparison

| Technology | How it works | Good for |
| --- | --- | --- |
| API | System A requests or sends data to system B when needed | Creating orders, checking stock, syncing master data |
| Webhook | System B notifies system A when an event happens | Payment notifications, order status changes |
| Middleware/iPaaS | An intermediary layer manages data flow between many applications | Companies with many interconnected applications |
| ETL | Data is collected, processed, then loaded into a target store | Dashboards, reports, and analytics |
| File transfer | Scheduled file exports and imports | Older systems without an API |

## Examples of System Integration in a Company

The example below is an illustration of a distributor's workflow across several applications, not a specific client case study:

1. A customer places an order in the online store. The store sends the order data to the ERP through an API.
2. The ERP deducts stock and creates an invoice. The warehouse system receives a picking instruction.
3. The payment gateway sends a webhook when payment succeeds. The invoice status in the ERP changes to paid.
4. The CRM receives the transaction data so the sales team can see purchase history and follow up by email or WhatsApp.
5. Every night, an ETL process pulls sales data from the ERP and CRM into a management dashboard.

Other examples close to businesses in Indonesia:

- **HRIS and payroll.** Attendance and leave data from the HRIS is sent to the payroll and accounting systems.
- **Point of sale and ERP.** Store checkout transactions update stock and sales journals right away.
- **Internal apps and legacy systems.** A new web app reads data from older desktop software through scheduled file exports until the old system is ready to be replaced.

## System Integration Challenges

Enterprise Integration Patterns lists criteria to weigh when designing an integration: application coupling, simplicity, the technology used, data format, data timeliness, sharing data or functionality, and synchronous versus asynchronous communication ([source](https://www.enterpriseintegrationpatterns.com/patterns/messaging/IntegrationStylesIntro.html)). In real projects these show up as:

- **Different data formats and meanings.** One application stores customer codes as numbers, another as text. You need an agreed data mapping.
- **Tightly coupled applications.** Hohpe and Woolf warn that tightly coupled applications make many assumptions about each other, so the integration breaks when one of them changes ([source](https://www.enterpriseintegrationpatterns.com/patterns/messaging/IntegrationStylesIntro.html)).
- **Duplicate and out-of-order messages.** Stripe writes that webhook endpoints might receive the same event more than once, and that Stripe does not guarantee event delivery in the order the events were generated ([source](https://docs.stripe.com/webhooks)). Receivers should log the event IDs they have processed.
- **Network failures and retries.** Stripe provides idempotency keys so requests can be retried safely without creating a second object or performing an update twice ([source](https://docs.stripe.com/api/idempotent_requests)). The same principle belongs in custom integrations.
- **Security.** Webhooks need their origin verified. Stripe verifies webhook deliveries using the Stripe-Signature header and an endpoint secret ([source](https://docs.stripe.com/webhooks)). API keys and secrets must be stored safely and given only the access they need.
- **Monitoring.** An integration that fails without any alert can leave systems out of sync without anyone noticing. You need logs, failure alerts, and a way to resend failed data.

## How to Plan a System Integration Project

The steps below can serve as a starting framework before you choose a tool or vendor:

1. **Map applications and data flows.** List every application in use, which data each team needs, and which business processes are still done by hand.
2. **Set a source of truth.** For each type of data, name one owning system. For example, customer data is owned by the CRM and stock data by the ERP.
3. **Choose a style and technology per integration point.** Real-time processes use APIs or webhooks, reporting uses ETL, and older systems without an API use file transfer.
4. **Design the data contract.** Document fields, formats, validation, and what happens when data is incomplete.
5. **Design error handling.** Decide on retries, duplicate prevention, a queue for failed messages, and who receives alerts.
6. **Test with real scenarios.** Run the flow from order to report with users through [UAT](https://www.ciptadusa.com/en/blog/uat-adalah) before go-live.
7. **Monitor and maintain.** Third-party APIs can change versions, so integrations need monitoring and updates. This belongs in your [app maintenance costs](https://www.ciptadusa.com/en/blog/biaya-maintenance-aplikasi).

If integration is part of building a new application, the work follows the [SDLC](https://www.ciptadusa.com/en/blog/sdlc-adalah), and the number of integrations affects [web application development costs](https://www.ciptadusa.com/en/blog/biaya-pembuatan-aplikasi-berbasis-web). For Next.js apps, we cover the technical patterns in [CMS and API integration in Next.js](https://www.ciptadusa.com/en/blog/nextjs-cms-api-integration).

## Off-the-Shelf or Custom Integration?

Some SaaS applications offer built-in connectors or can be linked through an iPaaS. That option makes sense when the flow is standard and connectors exist for every application you use. Custom integration is worth considering when:

- One of the applications is a legacy system or in-house software without a connector.
- The business rules are specific, such as customer-specific pricing or multi-level approval flows.
- Data must be processed or validated before it enters the target system.
- The company wants to own its integration code and documentation.

If an old application can no longer be kept, integration can serve as a temporary bridge while the replacement is built. See also [when a business needs custom software](https://www.ciptadusa.com/en/blog/kapan-bisnis-butuh-software-custom-2026).

## FAQ

### What is system integration?

System integration is the process of connecting different applications, databases, or data sources so they can exchange data and work as one ecosystem ([source](https://www.jitterbit.com/blog/what-is-system-integration/)).

### What are the types of system integration?

Types covered by Jitterbit and Kaseya include data integration, application integration (EAI), legacy system integration, cloud integration, B2B integration, and EDI ([source](https://www.jitterbit.com/blog/what-is-system-integration/), [source](https://www.kaseya.com/blog/system-integration/)).

### What is the difference between an API and a webhook in integration?

An API is called when a system needs data or wants to send a command. A webhook works the other way around: the source system sends data automatically when an event occurs, so the receiver does not have to keep checking ([source](https://docs.github.com/en/webhooks/about-webhooks)).

### Does an ERP count as system integration?

An ERP brings many business functions into one system, so some cross-department integration needs are handled inside it. The ERP still needs to be integrated with applications outside it, such as an online store, a payment gateway, or a CRM. Read [what an ERP is](https://www.ciptadusa.com/en/blog/erp-adalah) for context.

### What is an ESB?

An ESB (enterprise service bus) is an architectural pattern whereby a centralized software component performs integrations between applications ([source](https://www.ibm.com/think/topics/esb)). Every application connects to the ESB rather than directly to each other.

### How long does a system integration project take?

It depends on the number of applications, whether each one has an API, how complex the data mapping is, and whether data migration is needed. We do not quote a general figure because the range is wide. A verifiable estimate starts with the data flow mapping described above.

## Integrate Your Business Systems with CDS

PT Cipta Dua Saudara builds web apps, mobile apps, internal dashboards, and API integrations through [custom software development](https://www.ciptadusa.com/en/services/software), with REST APIs and webhooks as part of our stack. Data migration is part of the release plan, and the full source code and documentation are handed over to you. If you are not yet sure which applications need connecting, start with [IT consulting](https://www.ciptadusa.com/en/services/consulting) to map your data flows and options.

We also build our own products such as [Zetta CRM](https://www.ciptadusa.com/en/incubating/zetta-crm), a self-hosted CRM backend accessed through an API and an MCP server, for teams that want to connect contact and campaign data to AI agents. See [our portfolio](https://www.ciptadusa.com/en/works), or read the [guide to choosing a software development company in West Java](https://www.ciptadusa.com/en/blog/pilih-jasa-pembuatan-software-jawa-barat-20260907) before starting a project.


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