Hotel interoperability: how to get tools that don't speak to each other to communicate

A guest orders in-room breakfast via an app. The order arrives in the kitchen. But no one added it to the guest's bill in the PMS. At checkout, the receptionist sees nothing. The breakfast isn't charged. This isn't human error. It's an interoperability problem.

Interoperability is the ability of a hotel's IT tools to communicate with each other. When it works, information entered into one tool automatically appears where it's needed in others. When it doesn't, teams re-enter data, errors accumulate, and customer data becomes fragmented across systems.

This topic might seem reserved for IT managers of large chains. It's not. Every hotelier using more than one software is affected, whether they manage ten rooms or five hundred.

What it practically means for tools to "talk to each other"

When two software programs are interoperable, they exchange data in real-time without human intervention. A reservation received on Booking.com automatically enters the PMS. A check-in confirmed at the front desk triggers the automatic sending of a welcome message to the guest. A bar tab added to the POS appears on the guest's folio in the PMS.

The opposite is siloed operation. Each tool lives in its own bubble. For information to pass from one system to another, someone must manually re-enter it. It's slow, it's a source of errors, and it's an suboptimal use of team time.

A hotel's level of interoperability is not fixed. It directly depends on the tools chosen and how they have been configured to work together.

How an API works, without the jargon

An API is a communication interface between two software programs. The most accurate metaphor is that of a standardized plug: if your PMS and your guest satisfaction tool use the same standard, you plug one into the other and it works. No need to understand electricity to turn on the light.

Practically, here's what happens when two tools are connected via API. When a reservation enters the PMS, it automatically sends a signal to all connected tools: "new guest, arrival scheduled for the 15th, room 14, double bed preference." Each tool receives the information it needs and triggers the corresponding actions. The guest communication tool sends a pre-arrival message. The housekeeping software schedules room preparation. The revenue management tool records the reservation to refine its forecasts.

All of this without a single team member having to enter anything.

The difference between an open PMS and a closed PMS

Not all PMSs are equal when it comes to interoperability. It's one of the most important distinctions to understand before choosing or changing systems.

An "open" PMS (or API-first) is designed to connect with other tools. It exposes its data via a documented technical interface, accessible to partner developers. Connections are standardized, maintained, and often available in a library of certified connectors.

A "closed" PMS (or proprietary) limits connection possibilities. Either it doesn't offer an API, or access is restricted to a limited number of official partners. Adding a new tool to this environment often requires custom development, which is costly and fragile.

For an independent hotelier, the consequence is direct: a closed PMS locks them into its vendor's ecosystem. If a guest satisfaction tool, a revenue management software, or a concierge solution is not on the list of official partners, connection is not possible or requires significant investment.

Discussions about choosing or evolving a hotel's software stack often start with this question: does my PMS allow me to connect the tools I want, or does it make the choice for me? The article on the evolution of the hotel software stack addresses this fundamental question.

Certified Connectors and Custom Integrations: What's the Difference

When a PMS provider and a hotel software provider work together to build a connection, this is referred to as a certified connector or a native integration. Both parties actively maintain the link, notify each other of updates that could affect it, and ensure stable performance over time.

When the connection is built by a third-party developer, without validation from both providers, it's called a custom integration. It might work perfectly at first. But if the PMS releases a major update, the integration can silently break — without warning, sometimes for several days before the team notices.

Before adopting a new tool, checking whether the connection with your PMS is certified or not is one of the first questions to ask. This criterion is absent from most sales demonstrations, which showcase features rather than the technical conditions for their proper functioning.

The article on data flows between PMS, channel manager, and pricing tool illustrates these interdependencies with a practical example that impacts daily hotel distribution.

Four Practical Cases That Make a Difference

Interoperability is not an end in itself. What matters is what it enables in practice.

Billing without re-entry. A guest dines at the hotel restaurant. The restaurant POS is connected to the PMS. The consumption is automatically added to their folio. At check-out, the bill is complete, without any receptionist needing to verify and re-enter the restaurant charges. There is no risk of oversight. The time saved at the front desk is evident.

Event-triggered communication. The PMS detects a reservation with a birthday. The guest communication tool receives the information and automatically sends a personalized message two days before arrival. This type of automation is impossible without a connection between the two systems.

Real-time satisfaction. During their stay, a guest reports an issue via a digital interface. The information is sent to a centralized dashboard visible to the front desk. An intervention is initiated. If the issue is resolved before departure, the guest leaves satisfied and doesn't leave a negative review. Without a connection between the tools, this signal could have gone unnoticed.

Unified customer database. When the PMS, emailing tool, and satisfaction software are connected, the data for the same guest is consolidated in one place: stay history, declared preferences, satisfaction feedback, sent communications. A unified hotel database is only possible if the tools speak the same language.

What to check before adding a tool

Interoperability should be checked before signing, not after. Here are a few questions to assess the quality of a connection without being a technician.

Is the connection with my PMS certified by both vendors, or developed by a third party? If a PMS update is deployed, who maintains the connection? Does the integration use the official PMS API or does it directly access the database (which is riskier and more fragile)? Can the provider name hotels using the same PMS as mine with an active connection?

These questions reveal more about the actual quality of a tool than any sales demonstration.

Interoperability and property size: a misconception to debunk

Interoperability is often perceived as an issue for large hotels or international chains. This is a misconception. A twenty-room hotel using a PMS, a channel manager, and a guest communication tool has exactly the same connectivity needs as a two-hundred-room property.

The difference lies in the financial stakes: the larger the property, the more visible the cost of an hour of manual re-entry or a poorly synchronized reservation. But the problem structure is identical, and the available solutions are accessible to all types of properties.

Understanding how its tools communicate, or don't communicate, is the starting point for any serious consideration of a hotel's operational efficiency.

GetWelcom connects natively to the main PMS systems on the market via certified API, without technical intervention on existing systems. Reservation data automatically feeds guest communications, satisfaction surveys, and the hotel database.

To see how GetWelcom integrates with your software environment: request a free demo on getwelcom.com.