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API Integration Services

Third-party API integration is the process of connecting your software to external platforms β€” payment processors, CRMs, communication tools, cloud services, or industry-specific systems β€” so data and functionality flow between them without manual work. Instead of building every feature from scratch, you plug proven, purpose-built APIs into your existing product.

GMTA Software builds secure, production-grade third-party API integrations for startups, SaaS platforms, and enterprises across the US, UK, UAE, and Japan. We work with REST, SOAP, and GraphQL APIs, handle OAuth 2.0 and token-based authentication, and support both real-time (webhook/event-driven) and batch integration patterns β€” for systems ranging from a single payment gateway to multi-API, legacy-plus-cloud architectures.

For a free consultation

Our API Integration Services

With comprehensive API integration solutions, we seek to help businesses enhance their workflow and build sustainable business processes.

API integration strategy

API Integration Services

Full-cycle third-party API integration for your existing systems, covering requirements gathering, API selection, development, and rigorous testing. We document every endpoint and data flow, then provide ongoing post-launch support so integrations keep performing reliably long-term.

API integration implementation

Third-Party API Integration

Connecting your platform to payment, CRM, communication, and cloud APIs so data and functionality flow seamlessly between systems. We handle authentication, data mapping, and error handling for real-time and batch integrations, keeping every connection stable and secure.

Custom API development

API Integration Consulting

Assessing your systems and APIs to plan the right integration approach before any code is written. We audit existing connections, identify priorities based on business impact, and recommend whether custom development, modernization, or an off-the-shelf platform fits best.

Cloud API Development

API Modernization Consulting

Evaluating legacy or SOAP-based APIs that are slowing down integrations or blocking cloud adoption, and mapping a practical modernization path forward. We assess your existing architecture, identify what's worth refactoring or wrapping, and outline a realistic migration route toward microservices.

Third-party API integration

Custom API Development

Building new APIs when no third-party option fits your needs, designed to integrate cleanly with the systems you're already connecting. We handle architecture, security, and documentation from day one, so your custom API stays stable, scalable, and easy to maintain.

API Testing & Security

API Testing & Security

Performance, load, and security testing with OAuth 2.0/JWT authentication built into every integration from the start. We encrypt data in transit, apply rate limiting and API gateway controls, and run vulnerability checks before every deployment.

E-commerce API integration

Ongoing Support & Maintenance

Monitoring and updates as third-party APIs version, deprecate endpoints, or change without notice, so your integrations don't break unexpectedly. We track API health, apply fixes proactively, and keep documentation current, giving your team one less system to manage.

Payment API integration

Payment API integration

Our payment API integration services ensure secure and seamless payment processing. We combine many payment channels to give your clients various payment choices and improve ease and confidence.

Automaton of API Testing

Automaton of API Testing

We provide API testing automation to guarantee your APIs' proper and effective operation. Our automated testing systems find and repair problems fast, enhancing dependability and performance.

How We Integrate

API types and protocols

REST SOAP GraphQL gRPC

We choose the protocol based on what the third-party platform supports and what your system needs: GraphQL for precise data- fetching, REST for broad compatibility, SOAP for legacy enterprise systems.

Authentication & security

OAuth 2.0 API key auth JWT SAML HIPAA PCI-DSS

We apply encryption in transit, rate limiting, and API gateway controls to protect your data. For regulated industries, integrations are built with HIPAA or PCI-DSS requirements in mind from the design stage β€” not retrofitted after.

Integration patterns

Pattern Best for Trade-off
Point-to-point (direct
API-to-API)		 A small number of integrations, tight control needed Doesn't scale cleanly past a handful of connections
Custom middleware /
API gateway		 Multiple systems, need forcentralized auth, logging,rate limiting More upfront architecture work
iPaaS (e.g., Zapier, Workato,
MuleSoft, Boomi)		 Simple, high-volume, low-customization workflows Less control, ongoing platform fees, harder to customize deeply
Event-driven /
webhook-based		 Real-time sync (order status, inventory, payment events) Requires reliable retry/failure handling

When we are not the right fit

If you need 5–10 simple, off-the-shelf app-to-app connections, a no-code iPaaS platform like Zapier or Make is often faster and cheaper than custom development. We're the right fit when integrations involve custom logic, legacy systems, compliance requirements, or need to be embedded directly into your product rather than run alongside it.

What We Integrate

From first consultation to continuous assistance, our complete API integration and development services address everything. Count on us to provide scalable, safe, and excellent API integration services.

  • Payments: Stripe, PayPal, Braintree, Adyen, Razorpay
  • CRM & sales tools: Salesforce, HubSpot, Zoho
  • Communication: Twilio, SendGrid, Vonage/Nexmo
  • Cloud & infrastructure: AWS, Google Cloud, Microsoft Azure
  • Identity & social login: Google, Meta, LinkedIn, Apple Sign-In
  • Mapping & location: Google Maps, Mapbox
  • Accounting & ERP: QuickBooks, NetSuite, SAP
  • Shipping & logistics : FedEx, UPS, ShipStation, EasyPost
  • AI & LLM platforms: OpenAI, Anthropic, Google Gemini
  • Healthcare data standards: HL7 and FHIR-based systems, EHR-connected platforms
  • Financial data & compliance: banking and account-aggregation APIs, KYC/AML verifications
API integration

Cost & Timeline

Integration Complexity Typical Scope Rough Timeline
Single API, standard REST One payment gateway or communication API, no legacy involvement 2–4 weeks
Multiple APIs, moderate complexity 3–5 systems, some custom data mapping 4–8 weeks
Complex / legacy / regulated Legacy system integration, healthcare or fintech compliance requirements, real-time sync across many systems 2–4+ months

Actual timelines depend on API documentation quality, whether the third-party platform requires a partner or certification process (common with payment and healthcare APIs), and your existing system's architecture. We scope this precisely during the requirements-gathering phase.

Benefits of third-party API integration

01

Faster time to market

Using proven third-party APIs instead of building features from scratch cuts development time β€” on integration-heavy projects like EasyClaims, this translated to a 40% improvement in processing speed post-launch.

02

Lower development cost

Leveraging existing APIs for payments, communication, and data is materially cheaper than custom-building the same functionality in-house.

03

Security-first implementation

OAuth 2.0/JWT authentication, encryption in transit, and API gateway controls are standard on every integration, not an add-on.

04

Legacy system compatibility

We connect modern APIs to older, undocumented, or non-API-native systems through custom adapters β€” often the hardest part of an integration project, and where teams without this experience get stuck.

05

Built to scale

Integrations are architected to handle increasing transaction volume, users, and data without a rebuild.

06

Ongoing support

Post-launch maintenance and monitoring, since third-party APIs change versions, deprecate endpoints, and require updates over time.

Expert-Led Software Engineering for Innovation & Impact

Our experience across multiple industries enables us to design software that fits real operational environments rather than idealized use cases.

We develop healthcare systems that meet regulatory requirements while improving reliability and operational efficiency.
We build financial systems designed for transaction integrity, compliance, and high-volume usage.
Logistics software that improves visibility across supply chain operations and reduces coordination gaps.
We build digital learning platforms that support flexible content delivery, user management, and evolving instructional models.
We develop property management and transaction platforms that improve transparency, data access, and operational coordination.
We develop on-demand service platforms that coordinate bookings, scheduling, and provider availability at scale.
We build event platforms that manage registrations, scheduling, and audience engagement across formats.
We build agri-tech platforms that connect farmers, suppliers, and buyers through reliable data and logistics tools.
We develop aviation software that manages flight scheduling, ticketing, and operational coordination across systems.
We build astrology platforms that deliver personalized horoscopes, compatibility insights, and daily predictions.
We develop GPS tracking systems that provide real-time location data, geofencing, and route monitoring.
We build cruise booking platforms that manage itineraries, cabin availability, and secure payment processing.
We build fitness platforms that manage workout tracking, personalized coaching, and user engagement at scale.
We develop fantasy sports platforms that handle live scoring, league management, and secure payouts.
We build event platforms that manage registrations, scheduling, and audience engagement across formats.
We develop social platforms that handle matching, real-time messaging, and secure user verification.

API Integration &
Modernisation Consulting

Before writing code, we assess your current systems, APIs, and integration points to identify what's worth connecting, what's worth modernizing, and what's not worth touching yet. Our API integration consulting engagements typically include:

API Integration and Modernisation
1

API & systems assessment

Auditing Your Existing APIs, Third-Party Connections, And Integration Points For Performance Bottlenecks, Security Gaps, And Technical Debt

2

Integration roadmap

A Prioritized Plan For Which Integrations To Build First, Based On Business Impact And Technical Complexity

3

Build vs. buy vs. modernize recommendation

Honest Guidance On Whether You Need Custom Integration, A Modernization Of Existing APIs, Or An Off-The-Shelf IPaaS Platform

4

API governance guidance

Versioning Strategy, Documentation Standards, And Lifecycle Management Practices So Integrations Stay Maintainable As Your Team And API Surface Grow

Our Third-Party API Integration Process

Discovery Call
01

Requirements Gathering & Integration Planning Team

roject Manager, Business Analyst, Software Architect. We analyze your systems, define integration scope, and map which APIs, auth methods, and data flows are required before writing any code.

Audit
02

API Selection & Development Team

Project Manager, Back-end Engineer, Front-end Engineer We select the right APIs and protocols for your requirements and build the integration against your architecture.

Positioning
03

Testing Team

Project Manager, Back-end Engineer, Front-end Engineer Integration testing, security testing, and load testing before anything reaches production.

Listing Build
04

Documentation Team

Technical Writer Full documentation of endpoints, auth flows, data mappings, and error handling so your internal team can maintain and extend the integration.

Testing
05

Deployment, Maintenance & Updates Team

Back-end Engineer, Front-end Engineer. Post-launch monitoring and updates as third-party APIs version, deprecate, or change.

Key technologies & platforms

We work with leading platforms and technologies that empower digital transformation, accelerate delivery, and drive measurable business results.

Why Choose GMTA Software

Whether it’s detailed analysis of your business needs or streamlining complex integration processes, we do it right for your business.

Effortless integration

Certified Across the Platforms You Rely On

As an AWS, Salesforce, Microsoft, Adobe, and SAP partner, we don't just integrate with these platforms β€” we build to their standards. That partner status means faster troubleshooting, access to platform-specific best practices, and integrations that stay compliant as these ecosystems evolve.

A Proven Track Record

A Proven Track Record

With 200+ completed projects across healthcare, fintech, SaaS, and enterprise industries, we've seen the integration challenges that trip up first-time vendors β€” legacy systems, compliance requirements, undocumented APIs β€” and built the experience to solve them without surprises mid-project.

Tailored to the tee

A Dedicated Team for Every Phase

You won't get handed off between departments. The same dedicated project team stays with you from planning and API selection through development, testing, and post-launch support β€” so context never gets lost and accountability never gets diluted.

Continued support

Security Built In, Not Bolted On

Authentication, encryption, and security testing are part of our development process from day one β€” not a checklist item added before launch. Every integration we build is designed to protect your data and your users' data by default, not by exception.

Proven Results From Real Client Deliveries

Our work is reflected in real client deliveries built to operate reliably under production conditions and growing user demand.

Li-nk

Li-nk is an organization that aims to integrate its limousine services using the latest technology. They looked for an effective software solution where, over time, an increasing number of users would be able to access it with no reduction in quality. We designed and developed a scalable application that allowed Li-nk to onboard growing user volumes while maintaining consistent performance and usability.

View Portfolio View Case Study

Tokyo MK

Tokyo MK serves in the niche market segment with its business in providing top-notch consumer travel experiences in the aspect of mobility or transportation service delivery. The challenge was maintaining platform stability during peak demand. We optimized their digital systems, such as sales tracking systems and location-based discovery. This improved system performance and operational visibility while maintaining uninterrupted service during peak demand.

View Portfolio View Case Study

EasyClaims

EasyClaims offers 'digital solutions for easier insurance and claims processes.' They needed a 'secure, easy to use, and user-centric platform' to automate their insurance claims processes, reduce human intervention, and make the process comply with regulatory requirements. We delivered a compliance-ready platform that automated claims processing, reduced manual intervention, and improved operational accuracy.

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Blipearth

Blipearth aims to bring technology to the forefront in sustainability to ensure positive environmental changes. The modern digital solution they required necessitated levels of user interface, data management, and growing capacity. We delivered a custom platform that supported Blipearth’s sustainability goals through reliable data management, scalable architecture, and intuitive user workflows.

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CodocCall

GMTA Software offers CodocCall Healthcare App Development services to build secure telemedicine applications. Our healthcare apps include doctor consultation, appointment booking, video calling, e-prescriptions, patient management, and secure payment integration. We develop custom healthcare solutions for hospitals, clinics, and startups to improve patient care and streamline medical services.

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Match Magic

Match Magic offers professional dating app development services to build secure and scalable matchmaking applications. Our apps include user profiles, smart matching algorithms, chat and video calling, swipe features, real-time notifications, and secure payment integration. We develop custom dating solutions for startups and businesses to enhance user engagement and create meaningful connections with modern technology.

View Portfolio View Case Study
Client Success Stories
Client Success Stories

Frequently asked questions

Third-party API integration connects your software to external platforms β€” such as Stripe for payments, Salesforce for CRM, or Twilio for messaging β€” so data and functionality flow between systems automatically. It typically involves authentication setup (OAuth 2.0, API keys), data mapping, and testing before going live.

API integration consulting is the assessment and planning phase β€” auditing your current systems and APIs, identifying integration priorities, and recommending an approach β€” before any development starts. It's the right starting point if you're not yet sure what to build or whether to modernize existing APIs first. API integration development is the actual build: connecting the APIs, writing the integration code, and testing it. We offer both, and many engagements start with a short consulting phase before moving into development.

Yes. If you're running legacy or SOAP-based APIs, we assess your current architecture and recommend a practical modernization path β€” refactoring existing APIs, wrapping legacy systems in modern interfaces, or planning a migration toward microservices β€” based on what's actually worth changing versus what's stable enough to leave alone.

A single, well-documented REST API integration typically takes 2–4 weeks. Projects involving multiple systems, legacy infrastructure, or regulated-industry compliance usually run 2–4 months. We scope exact timelines during requirements gathering, based on API documentation quality and your existing architecture.

We implement OAuth 2.0, JWT, or SAML authentication depending on the API, encrypt data in transit, apply rate limiting and API gateway controls, and run security testing before deployment. For healthcare and payment integrations, we design to HIPAA and PCI-DSS requirements from the start.

Yes β€” this is one of the more common reasons companies bring in an integration partner rather than handling it internally. We build custom adapters and middleware to connect modern APIs to older or undocumented systems without disrupting existing operations.

Payment gateways, CRM platforms, communication APIs, cloud services, shipping and logistics APIs, and industry-specific systems for healthcare and fintech, including HL7/FHIR-based systems.

We architect integrations with your growth in mind β€” API gateway patterns, caching, and load-tested endpoints β€” so the integration continues to perform as transaction volume, user count, or data volume increases, rather than requiring a rebuild.

Third-party APIs version, deprecate endpoints, and occasionally have outages outside your control. Our post-launch support includes monitoring and updates so integrations are caught and fixed before they affect your users, not after.

For a handful of simple, low-customization connections, a no-code iPaaS tool is often faster and cheaper. Custom integration makes sense when you need integrations embedded directly into your product, involve legacy or compliance-sensitive systems, or require logic beyond what no-code platforms support. We'll tell you honestly during a consultation if your use case doesn't need custom development.

Awards & Recognition

Our commitment to excellence has been validated over the years by awards and recognition from renowned names, in addition to client appreciation, positioning us as the top mobile app development company globally.

Awards
clutch

Well-known for offering the best technological support and innovative, cutting-edge solutions for developing mobile apps.

goodfirm

Celebrated by the most popular websites for their unparalleled and outstanding solutions that increase the value of Mobile app development and web development.

designrush
goodfirm
shortlist
shortlist
clutch

Well-known for offering the best technological support and innovative, cutting-edge solutions for developing mobile apps.

Learn More
goodfirm

Celebrated by the most popular websites for their unparalleled and outstanding solutions that increase the value of Mobile app development and web development.

Learn More
designrush

A reliable partner! Their proficiency in app development is unmatched. Transparent processes, excellent communication, and exceptional outcomes

Learn More
shortlist

Impressed by their dedication to customer satisfaction. The app they developed exceeded all my expectations!

Learn More
trustpilot

With precision and passion, we engineer mobile apps that not only meet but exceed expectations, delivering value and driving growth.

Learn More

Our Happy Clients

know why our prime prospects trust our services and how they feel about working with us.

Our Happy Clients
Our Happy Clients
Our Happy Clients
Our Happy Clients
Our Happy Clients
Our Happy Clients
Our Happy Clients
Our Happy Clients

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Get in Touch

If you have questions or need assistance, we’re here to help! Feel free to reach out anytime by phone, email, or through our contact form. Let’s connect and turn your ideas into reality.

Endy Ong

Endy Ong

Insurance & Claim Management Solution

GMTA's flexible approach and prompt replies to client enquiries are among their business's assets. They have an excellent team of marketers and developers that are up to date on the latest technology and business trends.

Michelle Lim

Michelle Lim

E-Learning Solutions

GMTA Software Solutions did a really great job managing my E-learning app's development. The product is seamless and has helped me boost my business in the global market. Highly recommended!

Ong Siew Tiong

Ong Siew Tiong

Taxi Booking App

My experience with GMTA Software, developing the Li-nk app for premium limousine bookings, was exceptional. Their expertise and proactive approach ensured a top-tier product that exceeded expectations.

Kaiyang Lin

Kaiyang Lin

E-Commerce Solutions

GMTA have been a reliable partner for our project both from an analysis perspective to development and roll-out. The team has great knowledge of the service they were delivering.

Koji Matsuda

Koji Matsuda

Taxi App Development

GMTA Software developed my Tokyo MK app superbly. They understood my needs, used the latest tech, and delivered on time. Highly recommend for great app development service.

Srikanth Daniel

Srikanth Daniel

ChainLink Prayer

GMTA Software Solutions, working with Gaurav and Rohit, delivered excellent technical expertise and smooth communication. They partnered closely on every feature. Highly recommend for top-quality app development.

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