API Integration for PHP / Node.js / JavaScript

Planning, design and development of REST and Custom API, as well as integrations to external SaaS platforms, payments, marketing and cloud services. Security by OWASP, documentation by OpenAPI and deployment with CI/CD.

MethodologyCapabilitiesPackagesRequest a free consultation
  • Languages/Frameworks: PHP (Laravel/Symfony), Node.js (Express/NestJS), JavaScript/TypeScript.
  • Standards: OpenAPI 3.1/Swagger, JSON:API, GraphQL, Webhooks.
  • Security: OAuth2/OIDC, JWT, mTLS, API keys, secret rotation.
  • Reliability: idempotency, exponential backoff, circuit breaker, observability.

What does the service include

Development of REST and Custom API

  • Design-first approach with OpenAPI 3.1 and example payloads.
  • Versioning (v1/v2), stable status codes and unified errors.
  • Optimization: pagination, filters, sorting, caching.
  • Documentation and auto-generated SDK clients.

Integrations to external SaaS

  • Connection to payment, marketing, CRM/ERP, cloud and logistic platforms.
  • Event-based integrations with webhooks and secure signature verification.
  • Stable retry policies and idempotent operations.
  • ETL/ELT synchronization and data transformation.

Security and compliance

  • Control of access and authorization by roles; protection from BOLA/BFLA (OWASP).
  • OAuth2/OIDC, JWT, rate limiting and mTLS.
  • Secret management (vault), key rotation and audit logs.

Reliability and observability

  • Exponential backoff, circuit breaker and bulkhead models.
  • Tracing (OpenTelemetry), metrics and structured logs.
  • SLI/SLO/ SLA monitoring and alerts.

Methodology of API integrations

  1. 1

    Discovery and evaluation

    Inventory of systems, definition of target flows, selection of models: synchronous REST, webhooks or event-driven integration (queues/streams).

  2. 2

    Design-first with OpenAPI

    Creation of specifications (schemas, examples), coordination with teams, auto-generation of clients/tests and versioning.

  3. 3

    Security by OWASP

    Threat modeling, object level protection (BOLA), request rate, input validation and protected secrets.

  4. 4

    Implementation and tests

    Contract tests against OpenAPI, unit/integration tests. Error handling, idempotency and retries.

  5. 5

    Observability and exploitation

    Dashboards, alerts, request tracing, playbooks for incidents and version/backward compatibility plan.

Example packages

Starter

Single integration to an external SaaS or small REST module.

  • OpenAPI minimum specification
  • OAuth2/key authorization
  • Retry + idempotency
  • Basic monitoring

Growth

Multi-service integration and webhooks with queues.

  • Full OpenAPI documentation
  • Webhooks with signature verification
  • Queues/events and backoff
  • Extended metrics and alerts

Enterprise

High security, scale and compliance.

  • mTLS, secret rotation, audit
  • Schemas/validation, rate limiting
  • HA, circuit breaker, DR plan
  • SLA and 24/7 monitoring

Use cases and scenarios

Startup services

Quick integration with SaaS, payment and analytical instruments. Preparation for scale with a clear API architecture and documentation.

E-commerce

Integrations to ERP/WMS/courier, inventory synchronization, webhooks for payments and fraud, stable order flows.