Every time your team manually copies an enquiry from your website into your CRM — or exports an order from your website and imports it into Tally — you are paying for human time and introducing the possibility of errors. API integration connects your systems so data moves automatically. At Chulbul Design, we have been building API integrations for Indian businesses since 2013: payment gateways (Razorpay, PayU, Paytm), WhatsApp Business API, SMS and OTP (MSG91, Exotel), shipping (Shiprocket, Delhivery), CRMs (Zoho, HubSpot, Salesforce), ERPs and custom REST APIs. If two systems need to talk to each other, we make it happen.
Payment Gateway Integration — Razorpay, PayU, Stripe
A payment gateway integration is more than just adding a checkout button. We handle the full implementation: webhook listeners for payment success and failure events, automatic order status updates in your admin panel, GST invoice generation, refund processing, subscription billing and reconciliation reports. We have integrated Razorpay, PayU, Paytm Business, Cashfree, Instamojo and Stripe on websites ranging from small coaching businesses to large B2B platforms. Every integration is built with PCI-DSS compliance in mind and tested with real transactions before going live.
A Gurugram coaching company: automated payment collection + WhatsApp receipt eliminated 3 hours of daily admin work.
- Razorpay, PayU, Cashfree, Stripe — all major gateways
- Webhook handling for all payment events
- Auto GST invoice generation & email delivery
- Subscription & recurring billing supported
CRM & ERP Integration — Data Flows Without You
When a lead fills your contact form, it should appear in Zoho CRM or HubSpot — automatically, instantly, with all the fields mapped correctly. When an order is placed on your website, it should create a sales order in Tally or your ERP — without a human in the middle. We build bidirectional integrations between your website and your business systems: Zoho CRM, Zoho Books, HubSpot, Salesforce, Freshsales, SAP, Microsoft Dynamics, Tally (via Tally XML), and custom ERP systems built on any technology. Data mapping is handled precisely — no mismatched fields, no duplicate records, no data loss.
A Delhi B2B distributor: CRM integration means every RFQ from the website is in their sales pipeline within 10 seconds of submission.
- Zoho, HubSpot, Salesforce, Freshsales — all major CRMs
- Tally XML integration for Indian businesses
- Bidirectional sync — website ↔ CRM/ERP
- Error handling & retry logic built in
WhatsApp Business API — Automate Your Customer Communication
WhatsApp Business API allows you to send transactional messages at scale — order confirmations, OTPs, appointment reminders, payment receipts, shipping updates — programmatically from your website or app. This is different from WhatsApp Business (the phone app): the API version works server-side, handles thousands of messages per day and integrates with your CRM so every conversation is logged. We handle the Meta Business verification process, set up approved message templates, integrate the API with your website backend and connect it to your CRM so sales agents can respond from a single inbox.
A Mumbai edtech company: WhatsApp OTP + automated course welcome message reduced support tickets by 60%.
- Official WhatsApp Business API (Meta approved)
- OTP, order confirmation, reminder templates
- CRM inbox integration — agents respond from one place
- MSG91, Exotel, Twilio — SMS fallback included
200+
API Integrations Delivered
30+
Third-Party APIs We've Worked With
100%
Uptime SLA on Critical Integrations
10+
Years of Integration Experience
Popular API Integrations We Build
Any two systems that need to share data — we can connect them.
Payment Gateways
Razorpay, PayU, Cashfree, Stripe, Paytm. Full webhook handling, invoicing and refund management.
WhatsApp Business API
Automated OTPs, order updates, reminders and a CRM inbox for team responses — all via official Meta API.
CRM Integration
Leads from your website flow directly into Zoho, HubSpot, Salesforce or Freshsales — zero manual entry.
Shipping & Logistics
Shiprocket, Delhivery, Bluedart, DTDC. Auto-generate AWBs, track shipments and update customers in real time.
Email & SMS Automation
SendGrid, Mailchimp, MSG91, Exotel. Transactional emails + SMS triggered by website events automatically.
Custom REST / GraphQL
Third-party API you've never heard of? If it has documentation, we'll integrate it. Including legacy SOAP services.
How We Build an API Integration
System Mapping
We document which systems need to connect, what data flows where and what triggers each integration.
Data Mapping
Field-by-field mapping between systems — including data type conversions, null handling and validation rules.
Build & Test
Integration built in a staging environment, tested with real API calls, edge cases and failure scenarios.
Security Review
API keys stored securely, webhook signatures verified, rate limiting handled, all communications over HTTPS.
Monitor & Support
Error logging, alert notifications for failures and monthly health report. We know before you do if something breaks.
Stop Copying Data
Between Systems by Hand.
Tell us which two systems you want to connect. We'll tell you how it works and what it will cost — free consultation, no commitment, reply within 1 hour.