API in practice
API stands for Application Programming Interface. Put simply, it is a service door that one piece of software opens to other programs: it sets out which data can be requested, which actions can be performed and in what format. People use screens and buttons; programs use APIs.
For a business, APIs are what let tools talk to each other. The website can create a contact in the CRM, the management software can issue an invoice in the accounting program, the calendar can block a date as soon as a booking arrives. Each link of this kind is an integration, and it almost always goes through an API.
An everyday example: when you pay online, the shop does not handle your card directly. The website sends the amount to the payment service through its API, receives the confirmation and only then marks the order as paid. The same pattern applies to shipping, maps, sending emails and messages.
When you choose subscription software, check that it has a documented API: without one, your data stays locked inside and every future connection becomes difficult. Access keys should be treated like passwords, never pasted into emails or shared documents. And remember that APIs change: a connection needs to be checked and maintained over time.
