API Integration
Definition
Connecting your website to external services through their APIs. Enables features like payment processing, email marketing, and data synchronisation.
What is API Integration?
API integration connects your website or application to external services. Instead of building everything from scratch, you use APIs (Application Programming Interfaces) to tap into existing platforms – payment processors, email services, shipping providers, and more.
When your website processes a payment through Stripe or sends an order to your inventory system, that's API integration at work.
Common API Integrations
Payment Processing
- Stripe, PayPal, Square
- Website sends payment details, receives confirmation
Email Marketing
- Mailchimp, Klaviyo, ConvertKit
- Automatically add subscribers, trigger campaigns
Shipping and Fulfilment
- Royal Mail, DHL, ShipStation
- Calculate rates, create labels, track packages
CRM Systems
- HubSpot, Salesforce, Pipedrive
- Sync contacts, track interactions
Accounting
- Xero, QuickBooks, FreeAgent
- Sync invoices, payments, expenses
Social Media
- Meta, LinkedIn, Twitter
- Auto-post content, fetch analytics
How API Integration Works
- Your website sends a request to the external service
- The service processes the request
- The service sends back a response
- Your website uses that response
Example: Customer pays on your site > Website sends payment to Stripe API > Stripe processes card > Stripe confirms success > Website shows confirmation.
Types of Integration
| Type | Description | Example |
|---|---|---|
| One-way | Data flows in one direction | Sending form submissions to Mailchimp |
| Two-way | Data syncs both directions | CRM syncing with website contacts |
| Real-time | Instant data transfer | Payment processing |
| Batch | Periodic bulk updates | Nightly inventory sync |
Benefits for Business
- Automation – reduce manual data entry
- Accuracy – eliminate copy-paste errors
- Speed – instant data transfer
- Scalability – systems talk to each other automatically
Well-designed API integrations make businesses run more efficiently.