The more a business grows, the more separate systems it tends to use: a website, a CRM for customers, an invoicing tool, a payment gateway, perhaps an ERP. The problem arises when these systems don’t talk to each other and someone has to copy data manually from one to another.
What an API is, without the jargon
An API (application programming interface) is, essentially, a set of rules that lets two different programs exchange information automatically. When your website “connects” to Stripe to process a payment, or to your CRM to save a new customer, it does so through that service’s API.
Think of an API as a waiter between the kitchen (the external system) and the customer (your website): your website asks for something specific in a specific way, and the API returns the answer, without you needing to know how the external system works inside.
Common integrations that add real value
Payment gateways (Stripe, Redsys, PayPal). Let you take payments directly and securely on your website, without redirecting to unreliable external systems or handling each transaction manually.
CRMs (HubSpot, Salesforce, Pipedrive). When someone fills in a form on your website, they can automatically be created as a contact in your CRM, with all the information already organised for the sales team.
Email marketing tools (Mailchimp, Brevo). New subscribers or customers are automatically added to your email lists, segmented according to the form or action they completed.
Invoicing systems. Automatically generating invoices from orders or contracted services, without having to enter every detail by hand.
Webhooks for real-time sync. Instead of your website constantly asking “has anything changed?”, the external system automatically notifies it when a relevant event happens (a confirmed payment, a shipped order), which makes syncing far more efficient.
What to ask before starting an integration
- Does the external service have a documented, stable API? Not every tool offers the same guarantees of continuity.
- What happens if the integration fails? A payment that isn’t recorded properly, or a contact that never reaches the CRM, can have real consequences. You need a plan to detect and fix failures.
- What data is shared, and how is it protected? Any integration that moves customer data must comply with the applicable data protection regulations.
- Who maintains the integration when the external service changes its API? APIs evolve, and an unmaintained integration can silently stop working.
The real value of integrating your systems well
The aim of a good integration isn’t “having more connected technology”, but eliminating repetitive manual work and reducing human error. A business that copies data by hand between its website, its CRM and its invoicing system doesn’t just lose time: it builds up errors that, sooner or later, cost money or create a poor customer experience.