Simplileap

// Build

API integrations that fail gracefully — not silently

Custom REST and GraphQL API development, third-party integrations, payment gateways, CRM/ERP connectors, and webhook automation. Built with retry logic, circuit breakers, and monitoring that make your integrations as reliable as your core product.

// Standards

Integration engineering standards

Reliability by design

Retry logic, circuit breakers, idempotency keys, and dead letter queues — integrations designed to handle failures gracefully, not ignore them.

Security baseline

OAuth 2.0 or JWT authentication, input validation, rate limiting, HTTPS enforcement, and no credentials in code or logs.

OpenAPI documentation

Every custom API is documented with OpenAPI 3.0 — machine-readable specifications that enable client SDK generation and API portal publication.

Tested at failure modes

Integration tests cover error scenarios — API timeouts, 4xx errors, schema drift, and rate limit responses — not just happy paths.

Monitored in production

Error rates, latency percentiles, and integration health metrics are monitored and alerted from day one.

Dependency isolation

Third-party APIs are wrapped in adapter layers that prevent their failures or schema changes from cascading into your core product.

// Technology

Integration technology stack

API Design

OpenAPI 3.0RESTGraphQLgRPCSwagger UIRedoc

Backend Frameworks

Node.js / ExpressFastifyPython / FastAPINestJSHonotRPC

Authentication

JWTOAuth 2.0API KeysClerkAuth0Passport.js

Integration Platforms

n8nMakeZapierMuleSoftBoomiWorkato

Payments

StripeRazorpayPayUCashfreePayPalBraintree

Monitoring

DatadogSentryPostmanInsomniaArtilleryk6

// Process

From API design to monitored production integration

01

API Design

2–4 days

OpenAPI 3.0 specification defines resource models, endpoints, request/response schemas, authentication, and error codes. Reviewed before implementation.

// FAQ

Common questions about API integrations

What is the difference between REST and GraphQL?+

REST uses predefined resource endpoints — simple, cacheable, and well-understood. GraphQL uses a single endpoint with flexible queries — better for complex data relationships and multiple clients with different data needs. We recommend based on your specific access patterns.

How do you handle third-party API outages?+

Circuit breakers detect and isolate failing third-party services, preventing cascading failures. Retry logic with exponential backoff handles transient failures. Fallback responses ensure graceful degradation when services are unavailable.

What payment gateways do you integrate with?+

Stripe, Razorpay, PayU, Cashfree, and PayPal for most engagements. We also integrate with regional gateways as needed. For Indian businesses, Razorpay or Cashfree for UPI/NEFT support alongside cards.

Can you integrate with SAP or legacy ERP systems?+

Yes — SAP BAPI, RFC, and OData APIs; NetSuite SuiteScript and REST; Oracle ERP APIs. ERP integration is complex but we have delivered it successfully across multiple enterprise engagements.

How do you secure webhook endpoints?+

HMAC-SHA256 signature verification on every incoming webhook ensures the request is from the expected source. We implement idempotency to prevent duplicate processing of retried webhooks.

Ready to connect your systems reliably?