CRM systems, document management platforms, task trackers, and corporate messengers can exchange data and work together through APIs. This technology helps companies connect services and automate workflows. We explain what an API is, how it works, and what it enables for business.
What is an API in simple terms
API (Application Programming Interface) is a universal language through which applications, servers, and web services communicate. Think of it as an intermediary that helps different programs understand each other and exchange information according to predefined rules.
Put even more simply, an API is a set of ready-made commands and functions that allow one program to use another program's capabilities. You do not need to know how a service works internally: you only need to know which requests to send and which responses to receive.
How an API works
Consider a familiar analogy. When you order food at a restaurant, you do not go into the kitchen and prepare it yourself. Instead, you place an order with a waiter (the API), who passes your request to the chef (the server) and brings the prepared dish back. A programming interface works in much the same way: an application sends a request, the server processes it, and returns a result.
Technically, this is a sequence: a client creates a request according to specific rules (method, address, parameters), the server validates it, performs the operation, and returns a structured result, usually in JSON or XML format.
Benefits of APIs for business
As a company grows, new tasks and digital tools emerge. This does not always mean abandoning existing solutions: APIs make it possible to integrate them with new services and extend the capabilities of existing IT infrastructure.
This approach offers businesses several advantages:
- Service integration. CRM, electronic document management, messaging, and other applications can exchange information without manual data transfer.
- Task automation. For example, when a request's status changes in CRM, the system can automatically notify the responsible employee.
- Lower development costs. Instead of building every feature from scratch, developers can use existing services through their APIs.
- Flexibility. A company can adapt integrations to its processes and connect new systems as needed.
- Controlled data access. APIs allow access to specific system functions and data to be restricted through authorization and access controls.
Types of APIs and their uses
There are several main types of APIs that differ in architecture and operation:
REST API
The most popular and versatile type. It follows a request-response model, does not retain state between requests, and is well suited to integrating web applications with servers.
SOAP API
A more strictly defined protocol with higher security requirements. It is often used in enterprise systems where strong data protection is important.
Web API
Specialized interfaces for browser-based functionality that allow applications to control page elements, play media, and respond to user actions.
How to connect an API: step-by-step guide
To integrate two applications through an API, first make sure the relevant service supports such a connection, then configure data exchange. Specific steps depend on the system, but the general process is usually as follows:
- Find the API documentation. It describes which functions are available for integration, how to send requests, and which format the service uses for responses. Documentation is usually published on the developer's website.
- Get API access. Depending on the service, you may need to register an application, create an API key, or configure another authorization method. These credentials let the system identify the requester and permitted actions.
- Configure the interaction. The developer decides which data must pass between applications and configures API requests. For example, a new CRM request can automatically trigger a notification in the corporate messenger.
- Test the integration. Before launch, make sure requests are handled correctly, data is transferred in the required format, and the system responds properly to errors and denied access.
APIs in corporate messengers: the eXpress example
With APIs, a messenger can receive data from corporate systems, send automated notifications, and provide access to work services.
Let's look at how these integrations work in eXpress.
BotX API and Bot API: how bot integration works in eXpress
In eXpress, the BotX microservice is used for interactions between bots and the messenger. It enables data exchange between the platform and external applications through a RESTful HTTP API.
Two interfaces are involved:
- BotX API — allows an external application to send commands to eXpress, such as initiating a message on behalf of a bot.
- Bot API — passes user events and commands from the messenger to the bot application.
For example, if a corporate system needs to notify an employee about a new task, the integration sends a request to BotX API. Once processed, the bot sends a message in eXpress.
The interaction can also work in reverse: an employee sends a command to the bot, the application receives it through Bot API, processes it, and contacts the corporate system for data if needed.
To develop these integrations, eXpress provides the pybotx Python library, BotX API and Bot API documentation, and usage examples.
SmartApps: using corporate services inside the messenger
APIs can be used not only to exchange messages but also to interact with corporate application functions.
eXpress offers SmartApps for this purpose: mini-applications that open directly inside the messenger.
For example, an employee can open a meeting-room booking mini-app, select a date and time, and submit a request. Through an API, the mini-app interacts with the connected booking system, which checks room availability and saves the reservation.
The same principle can be used to manage leave requests, obtain certificates, or contact technical support.
Unlike chatbots, where interaction typically takes place through messages and commands, SmartApps provide a graphical interface with forms, buttons, and other controls.
Examples of API use in eXpress
Consider two scenarios that demonstrate different ways of using APIs in a corporate messenger.
1. Meeting notifications through a chatbot
Suppose an employee creates a meeting in the corporate calendar. The integration receives information about the event and sends a request to BotX API. Once the request is processed, the bot sends participants a message in eXpress with the meeting date, time, and details.
If the organizer reschedules the meeting, the integration receives updated information and triggers another notification.
As a result, calendar information reaches the messenger automatically, and employees do not have to forward changes to colleagues manually.
2. Contacting technical support through a SmartApp
An employee opens the technical-support mini-app in eXpress, selects an issue category, describes the problem, and submits a request.
The mini-app sends the data through an API to the connected Service Desk system, where a ticket is created. Once the request is processed, the employee can see the ticket number and current status in the mini-app interface.
Conclusion
APIs are one of the key tools of modern software development. They allow companies to use capabilities from different services in their products, create new features, and build workflows around their own needs.
We have shown several examples of API use on the eXpress platform. If you would like to learn more about messenger integration options, submit a request and our team will contact you for a consultation.