Integrations & Custom API Development
Reliable Glue Between the Tools You Already Run
Most production systems aren't broken by a single big problem — they're slowed by the gaps between tools. CRM doesn't talk to the billing system. Payment provider doesn't sync to accounting. Inbound leads from five channels end up in four different spreadsheets. Zyfolks closes those gaps with production-grade integrations and custom APIs that survive retries, outages, and the occasional bad data.
We also build APIs as products: versioned, documented, rate-limited, and packaged for internal teams, partners, or third-party developers. If you're selling API access — or exposing internal capability to an AI agent layer — the contract matters as much as the code.
What We Build
The job splits into two sides: (1) integrations, where we connect your software to systems you don't own, and (2) custom APIs, where we build the endpoint layer other systems call into. Most engagements involve both.
Key Features
- Payment Gateway Integrations: Stripe, Razorpay, PayPal, Paddle, Cashfree, CCAvenue, and crypto-native rails. Checkout flows, subscriptions, refunds, webhooks, and dunning. See our dedicated Custom Payment Gateway Integration service.
- CRM & Marketing Automation: Two-way sync with Salesforce, HubSpot, Zoho, Pipedrive, ActiveCampaign, and custom CRMs — with field mapping, dedup, and drift reconciliation.
- ERP & Finance Integration: SAP, Oracle NetSuite, Microsoft Dynamics, QuickBooks, Xero, Odoo — with invoice sync, journal posting, and reconciliation dashboards.
- Messaging & Collaboration: Slack, Teams, WhatsApp Business, Telegram, SMS, and email — bidirectional for notifications, support, and AI agent channels.
- Custom REST & GraphQL APIs: Versioned, OpenAPI / GraphQL-schema-documented, OAuth 2.0 or API key secured, rate-limited, published via a developer portal.
- Webhook & Event Infrastructure: Reliable delivery, idempotent handlers, dead-letter queues, retry with exponential backoff, and signed payloads for verification.
- AI-Ready Endpoints: APIs designed to be called by AI agents — structured responses, clear error codes, scoped auth, and semantic action names so LLMs can use them reliably.
- Legacy System Adapters: Middleware that isolates legacy edge cases — queuing, format translation, error normalization — so your modern apps stay clean.
Frequently Asked
Questions
Common questions about custom integrations, APIs, and data pipelines.
Payment gateways (Stripe, Razorpay, Paddle, PayPal), CRM sync (Salesforce, HubSpot, Zoho), ERP connectors (SAP, NetSuite, Odoo), messaging (Slack, Teams, WhatsApp, Telegram), analytics (Segment, Mixpanel, GA4), and custom webhook pipelines between any two systems with APIs. If it has an endpoint or a webhook, we can glue it in.
Yes. REST and GraphQL APIs, versioned, documented with OpenAPI / GraphQL schemas, rate-limited, secured with OAuth 2.0 or API keys, and published via an internal or public developer portal. If you're selling API access as a product, we'll also build the self-serve key management and usage-based billing layer.
Yes, with a warning label: legacy integrations usually need a middleware layer (queue-based, retry-safe, with audit logs) because direct calls to brittle legacy systems break under load. We build adapters that isolate the legacy edge cases so your modern apps stay clean.
Idempotent retries, dead-letter queues, alerting on repeated failures, reconciliation jobs that detect drift between systems, and dashboards showing sync health. Integrations fail — the question is whether you know about it in minutes or in months.
Both. Plain glue code when the rules are deterministic. AI-assisted routing when the inputs are unstructured (inbound emails, free-text tickets, scanned documents). We often mix: AI classifies / extracts, traditional automation executes the downstream action.
A single-system integration (one direction, clean API, no edge cases): ₹1.5L–₹4L (roughly \$2k–\$5k). Multi-system sync with error handling, dashboards, and production monitoring: ₹8L–₹25L (\$10k–\$30k). Custom API product with developer portal: starts around ₹20L (\$25k). Discovery is paid and always precedes a fixed-price quote.