API Integration Services

Affix Center connects your systems - payment gateways, ERPs, CRMs and third-party services - with reliable, secure API integrations so data flows without manual re-entry.

Software Product EngineeringAPI Integration Services

API integration connects separate software systems through their application programming interfaces, so data and actions flow between them automatically. Affix Center builds and maintains integrations between ERPs, CRMs, payment gateways, government services and SaaS tools, and designs custom APIs for your own systems.

The challenge

Problems we solve

  • The same data typed into several systems by hand
  • Orders, payments or leads lost between systems
  • Integrations that break silently and no one notices
  • Partners asking for API access you cannot provide

Our capabilities

What we deliver

Third-Party Integrations

Connect to the services your business relies on.

  • Payment gateways
  • SMS, email and WhatsApp
  • Maps, KYC and e-sign services
  • Government and GST APIs

System-to-System Integration

Keep your core systems in sync.

  • ERP and CRM integration
  • E-commerce and accounting sync
  • HRMS and payroll integration
  • Real-time and batch data flows

Custom API Development

Expose your own services safely.

  • REST and GraphQL APIs
  • OAuth2 and API key security
  • OpenAPI documentation
  • Rate limiting and versioning

Monitoring & Reliability

Integrations you can depend on.

  • Retry and error handling
  • Integration monitoring and alerts
  • Logging and audit trails
  • Ongoing maintenance as APIs change

Our approach

How we deliver API Integration Services

A structured, transparent engagement with clear checkpoints at every stage.

Discovery

  • Goals, users and success metrics
  • Scope, priorities and MVP definition
  • Architecture and estimate

Design

  • User flows and wireframes
  • UI design and clickable prototypes
  • Technical design and API contracts

Build & test

  • Two-week sprints with demos
  • Automated and manual QA
  • Security testing before launch

Launch & grow

  • Deployment and monitoring
  • Store releases and handover
  • Support, analytics and new features

Technology & standards

  • REST / GraphQL
  • Node.js
  • Java
  • Python
  • Webhooks
  • Message queues
  • OpenAPI / Swagger
  • OAuth2

Industries we serve

  • Startups & product companies
  • Enterprises
  • Government & public sector
  • Education
  • Healthcare
  • Retail & e-commerce

Who it is for

  • Businesses running several disconnected systems
  • E-commerce and fintech teams integrating payments
  • Companies offering APIs to partners
  • IT teams maintaining fragile integrations

Why Affix Center

Mumbai team, India-wide delivery

We work out of Lower Parel, Mumbai and deliver for clients across India, on-site when it matters and remotely when it does not.

In business since 2014

A decade of building and running systems for government bodies, enterprises and growing businesses.

ISO certified processes

Delivery run on ISO 9001, ISO 27001 and ISO 20000 certified processes for quality, information security and IT service management.

One partner, end to end

Strategy, build, hosting, security and support from one accountable team - no hand-offs between vendors.

Let's discuss your API Integration Services requirement

Tell us what you need and our team will get back to you within 2 business days.

Contact UsCall +91 98700-61247

Frequently asked questions

What are API integration services?

They are services that connect software systems through their APIs so data and actions flow between them automatically, plus building and documenting custom APIs.

Can you integrate a system that has no API?

Often yes - through database connectors, file exchange or RPA - and we can build an API layer on top.

How do you keep integrations secure?

With encrypted connections, token-based authentication, least-privilege access and audit logging.

What happens when a third-party API changes?

Under a support plan we monitor integrations and update them when providers change their APIs.

Where is Affix Center based, and where do you deliver?

Our office is in Lower Parel, Mumbai (Mathurdas Mill Compound, A-101, 1st Floor, Todi Building, Mumbai 400013). We deliver for clients across India, on-site where it matters and remotely otherwise.

How do I start a conversation?

Call +91 98700-61247, email admin@affixcenter.com, or use the contact form; our team replies within 2 business days.