Integrations: connecting the systems your business runs on
Each page here covers one system: what an integration with it does, the data that moves each way, the limits the vendor documents, what tends to fail, and when the vendor's own plugin or a no-code connector is enough. Every page is written from the vendor's current documentation and lists its sources.
Before you choose how to connect two systems
Most integrations can be done three ways, and the cheapest one that holds up is the right one.
| Route | Suits | Watch for |
|---|---|---|
| The vendor's own plugin or app | A standard store or CMS talking to a popular service | Stops where the plugin's options stop |
| A no-code connector | Low volume, simple rules, popular apps on both sides | Per-task pricing at volume; failures that nobody sees |
| A custom integration | High volume, business-specific rules, a system with no ready-made connector | Needs someone to maintain it when either side changes its API |
Whichever route you take, four things decide whether it can be trusted: incoming messages are verified, a message that arrives twice does no harm, a message that never arrives is caught by a scheduled check, and every exchange is logged. The webhook entry explains why.
The guides below are grouped by what the system does. Each says plainly when you do not need a developer at all.
Analytics and ads
- Google Analytics 4What a correct GA4 and Tag Manager setup involves: event design, consent mode, server-side events and the limits Google documents.
- Meta Conversions APIHow the Meta Pixel and Conversions API work together: server events, hashing, deduplication by event ID, consent, and the limits Meta documents.
Maps
Tax and compliance
AI models
- OpenAI APIHow to integrate the OpenAI API into an existing app: the server-side flow, structured outputs, cost per request from OpenAI's October 2026 prices, rate-limit tiers and data controls.
- Claude APIHow to integrate Anthropic's Claude API into existing software: the Messages API flow, JSON outputs, cost per request from Anthropic's October 2026 prices, rate-limit tiers and data terms.
Payments
- RazorpayWhat a Razorpay integration involves: order creation, signature checks, webhooks, refunds and settlement matching, with the limits Razorpay documents.
- UPI AutopayHow a UPI Autopay integration works through a payment gateway: mandate registration, the ₹15,000 rule, pre-debit notices, retries and subscription states.
- StripeHow a Stripe integration works for an Indian business selling abroad: invite-only accounts, export declarations, Checkout, signed webhooks and idempotent fulfilment.
Accounting
Shopify
- Shopify Admin APIThe technical rules behind any Shopify integration or custom app: GraphQL cost limits by plan, quarterly API versions, signed webhooks, bulk operations and customer-data access.
- Shopify to TallyHow Shopify orders become TallyPrime vouchers: the mapping for sales, GST, shipping, discounts, COD, gateway settlements and refunds, how often it syncs, and what breaks.
- Shopify and ShiprocketWhat Shiprocket's Shopify app already does, where it stops, and the custom work merchants add: COD confirmation before dispatch, NDR handling on WhatsApp, and courier rules.
CRM
- Zoho CRMHow a website, store or custom app sends leads and orders into Zoho CRM: the upsert API, duplicate checks, API credit limits by edition, and when Zoho's webforms are enough.
- HubSpotHow a website, app or store syncs contacts and deals with HubSpot: upsert by email, deal associations, rate limits by tier, signed webhooks, and when HubSpot forms are enough.
Messaging
- WhatsApp Business APIWhat a WhatsApp Business API integration involves: template approval, the 24-hour window, webhooks, opt-in and per-message pricing, from Meta's documentation.
- WhatsApp to CRMHow inbound WhatsApp messages become CRM leads with source, owner and history: the Cloud API webhook, field mapping, the 24-hour reply window, duplicates and ad attribution.
Shipping
Related
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