Hire an API Integration Developer to Connect Your Systems
Connect your website, app or store with Razorpay, Shiprocket, a CRM, WhatsApp or accounting software. Each API integration developer here lists starting prices and delivery times, so you can order the exact connection you need.
What is API integration?
An API (application programming interface) is a door one software system opens so another can send it data or ask for data. API integration is the work of connecting two systems through those doors. When a customer pays on your website and the order appears in Shiprocket and a confirmation reaches them on WhatsApp, three APIs are working together.
An API integration developer reads the other system's documentation, writes the code that sends requests and handles replies (usually in JSON format), and makes sure failures do not lose orders or data. Most modern services offer a REST API, where each request goes to a web address with a method such as GET or POST.
In practice, most small businesses hire an API integration developer for online payments, automatic shipping labels, website leads that land in a CRM, or WhatsApp alerts on new orders.
REST API development and integration cost in India
Pricing depends on how good the third party's documentation is, how many events you need to handle, and whether the developer must also build your side of the API. Typical freelance quotes:
| Integration | Typical freelance price |
|---|---|
| Website form to CRM (Zoho, HubSpot, LeadSquared) | ₹3,000–₹12,000 |
| Payment gateway on a custom website | ₹4,000–₹20,000 |
| Courier or shipping API for an online store | ₹6,000–₹25,000 |
| Two-way sync between two business systems | ₹15,000–₹60,000 |
| Building your own REST API for an app | ₹20,000–₹1,00,000 |
| Hourly rate | ₹500–₹2,000 per hour |
On Naukri Mitra, API integration gigs start from ₹1,999. Plugins on WordPress or Shopify can be cheaper than custom code, so a fair API integration developer will mention when a ready plugin does the job.
Payment, shipping and CRM integrations Indian businesses ask for
How to integrate Razorpay in a website
A standard Razorpay payment gateway integration for a website has three parts. Your server creates an order through the Razorpay Orders API, the website opens Razorpay Checkout for the customer, and your server verifies the payment signature with your secret key before marking the order paid. A webhook for events such as payment captured or refund processed catches cases where the customer closes the browser too early. Everything is tested with test-mode keys before switching to live keys.
Which payment gateway API is best in India?
Razorpay, Cashfree, PayU, PhonePe and CCAvenue all support UPI, cards and net banking. Choose on fees you are offered, settlement time, the plugins available for your platform and the quality of documentation. Razorpay and Cashfree are popular with developers for clear docs and test tools.
How to integrate Shiprocket API
Shiprocket API integration for ecommerce usually means: generate an auth token with a dedicated API user, push new orders, assign a courier and AWB number, request pickup, fetch the shipping label, and pull tracking updates. A careful API integration developer also handles cancellations and returns, which many quick integrations forget.
Integrate CRM with website forms via API
Instead of copying enquiries from email into a CRM, the form sends each lead straight to the CRM's API with the source page and campaign tags. Duplicate checks on mobile number stop the same person being added three times.
REST API vs GraphQL, webhooks and OAuth in plain words
REST API vs GraphQL
REST uses a separate address for each type of data, such as /orders or /customers. GraphQL uses one address where you ask for exactly the fields you want in a single request. REST is more common and simpler to debug; GraphQL helps apps that need data from many sources on one screen.
What is a webhook?
A webhook is the reverse of a normal API call. Instead of your system asking "any new payments?" every minute, the other service sends a message to your web address the moment something happens. Webhooks make payment and shipping updates instant.
What is OAuth authentication?
OAuth 2.0 allows a user to give your app limited access to their account on another service, such as Google or Zoho, without sharing their password. The user clicks "Allow", and your app receives a token that the user can revoke later.
Is API integration secure?
It is secure when it is built carefully. Most leaks happen because of careless handling of credentials, not because the API itself is weak.
How to keep API keys safe
- Ask the API integration developer to keep API keys and secrets on the server, in environment variables, never inside website JavaScript or an Android app.
- Never commit keys to Git. Create separate keys for testing and for live use.
- Rotate keys after a developer leaves, and give each integration only the permissions it needs.
- Verify every webhook signature so nobody can fake a "payment successful" message.
Respect rate limiting too. Most APIs allow a fixed number of calls per minute, and an integration that ignores this will be blocked during a sale, exactly when you need it most.
How to test API integration and handle failures
What is Postman used for?
Postman is a tool for sending test requests to an API and seeing the raw replies. Your API integration developer can share a Postman collection so anyone can repeat each call later. Many providers also publish Swagger (OpenAPI) documentation that shows every endpoint and field.
How to test API integration
Test the happy path, then the failures: wrong card, timeout, duplicate webhook, expired token, empty fields. For payments, try a successful payment, a failed one, and a refund in test mode before you go live.
How to handle API errors and retries
An experienced API integration developer logs each failed call, retries temporary errors after a short wait, and stops after a few attempts instead of looping forever. Failed orders should land in a list someone checks daily.
What happens if a third-party API changes?
Established providers usually announce version changes in advance, often months ahead. Ask the API integration developer to note the API version used, and keep a small maintenance budget so someone can update the code when a version is retired.
What to share with an API integration developer
The documentation needed for API integration is mostly the provider's own docs, plus access on your side. Before the work starts, send:
- Links to the API documentation of every service involved.
- Sandbox or test credentials, shared once the order is taken, never in an open message.
- Your platform (WordPress, Shopify, Laravel, Node.js) and server access if code must be deployed.
- A step-by-step description of what should happen, for example "when an order is paid, create a Shiprocket shipment and send the AWB on WhatsApp".
Naukri Mitra chat strips out phone numbers, emails and links, and mobile numbers become visible to you and the developer only after your order is taken, so hold back credentials until then. Because the money goes to the developer and not through the platform, pay in two parts: after a working test-mode demo, then after going live. For no-code options, see Zapier and Make automation; for bigger builds, browse software and programming.
API Integration: frequently asked questions
How much does API integration cost in India?
Simple integrations, such as sending website form leads to a CRM, usually cost ₹3,000 to ₹12,000. Payment gateway work on a custom site is often ₹4,000 to ₹20,000, and courier APIs ₹6,000 to ₹25,000. Two-way syncs between business systems and custom API builds cost more. An API integration developer may also charge ₹500 to ₹2,000 per hour.
How long does API integration take?
A single, well-documented integration such as Razorpay or a CRM form usually takes two to five working days, including testing. Courier integrations with returns and tracking take one to two weeks. Two-way syncs can take three to six weeks. Waiting for the provider to approve live access often adds a few days.
Can you integrate two software systems without an API?
Sometimes. Options include scheduled CSV or Excel exports and imports, reading data from a shared database, email parsing, or browser automation as a last resort. These are less reliable than an API and break more easily. Ask the vendor first whether a hidden or paid API exists, since many do.
Can Zapier do API integration without coding?
For common apps, yes. Zapier and Make connect popular tools through ready-made connectors, and their webhook steps can call simple APIs. They become costly at high volumes and struggle with complex logic, signature checks or Indian services that lack a connector. That is when custom code from a developer is better.
Should I hire a freelance API integration developer or an agency?
For one to three integrations, a freelancer is usually quicker and cheaper, because you deal directly with the person writing the code. Agencies make sense for large projects with several developers and formal support contracts. Either way, ask for a past integration with the same provider.
Can I hire an API integration developer in India for a startup?
Yes. Startups commonly need payments, SMS or WhatsApp alerts, KYC checks and analytics connected in the first few months. Pick an API integration developer in India for your startup who also documents every integration, so your future team can maintain them without guessing.
- Do not pay the full amount in advance. Pay in parts as the work is delivered.
- Never share your OTP, UPI PIN, card details or bank password with anyone.
- Do not open .apk or .exe files, and do not install AnyDesk, TeamViewer or any screen-sharing app on anyone’s request.
Naukri Mitra only connects clients and freelancers. We are not a party to your agreement, we do not hold or process payments for the work, and we do not guarantee the quality, delivery or payment. Price, work and payment are agreed directly between you. Terms · Prohibited services