A defined contract
Each API defines the requests it accepts and the data it returns.
[ glossary — software ]
What is API integration?
A plain-English guide to API integration for founders and teams who want their tools to talk to each other without manual work.
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( how it works )
One system calls another.
Authenticated requests
Systems identify themselves with keys or tokens so only approved callers connect.
Data exchange
The systems send and receive structured data, like payments or order records.
Automated actions
Events in one system trigger updates in another, removing manual entry.
( where it fits )
Common integrations that save time.
Payments
Accept and reconcile card payments with processors like Stripe and Shopify Payments.
Commerce
Sync orders, inventory, and shipping between storefront and fulfilment systems.
CRM and marketing
Move leads and contacts into your CRM and email automation automatically.
Accounting and AI
Post invoices to accounting and feed business data to AI agents for automation.
( faq )
Questions buyers ask
What is an API?
An API, or Application Programming Interface, is a defined way for software to request data or actions from another system. It's a contract that lets programs talk to each other.
Why do I need API integrations?
Integrations connect tools that would otherwise be siloed, saving manual work, reducing errors, and enabling real-time data flow between systems.
What are common API integration examples?
Payment processing, eCommerce inventory sync, email marketing, CRM, accounting, analytics, shipping, and authentication services.
Is API integration secure?
Yes, when done right. Best practice uses authentication keys, encrypted transport, scoped permissions, rate limiting, and monitoring.
How long does an integration take?
It varies from a few days for a simple standard API to several weeks for complex, custom, or legacy systems.
Can Udaan build API integrations?
Yes. We connect payment, commerce, CRM, accounting, AI, and internal systems so your tools work together reliably.