Belitsoft > API Integration Services | Custom API Development Company

API Integration Services | Custom API Development Company

Belitsoft is an API development company with development center in Eastern Europe. We have been providing top-quality API development and API integration services since 2012.

Our API services

API for Mobile Application Development API for Mobile Application Development
Web API development Web API development
Private API development pen API development / Private API development
Cloud API Development Cloud API Development
RESTful APIs Third Party App Integration (RESTful APIs)
API gateway development / API proxy development API gateway development / API proxy development

Why Choose Belitsoft API Development Company



Our API specialists, who have extensive experience in providing API development and integration services, using C, C++, Java, Python, and PHP, create powerful, secure, and easily maintainable APIs. API masters from a business software development company Belitsoft has technical expertise in working with the most popular APIs such as Google APIs, Yahoo APIs, Social Media APIs (Twitter, Facebook, LinkedIn, Instagram), Marketplaces APIs (eBay), other APIs, and mashups.

API Costs


Hire API developers from Belitsoft and get significant cost-savings. Why? First, the total cost of your project will be much cheaper than the cost of the same project development in the USA. Secondly, our skilled and experienced developers leverage the latest technologies and follow best practices, so our APIs are built secure and high-performance that lets avoid wasting time and money on support and maintenance.



We successfully build APIs of high performance and security for any industry and right for your specific requirements. Our developers use the SOAP / REST API methods to provide data processing in different programming languages. We document all the APIs using Swagger to make them more convenient to work with



We are experts in creating new APIs and integrating your application with an interface of an existing API. Our team of experienced IT specialists offer API development and integration services, providing you with a custom rich in functions API solution.

Custom API development

Custom API development

We apply individual approach while strictly following the REST architecture. We provide clean and well-structured programming code, use best development tools, and build high-performance APIs for your needs.

Mobile API development

Mobile API development

We create APIs, which let make payments, appointments, find a geolocation etc., to enrich your mobile applications.

API development for Cloud computing

Cloud API development

Cloud computing uses APIs to connect different platforms and services. PaaS APIs provide access and functionality for a cloud environment, including integration with databases, messaging systems, portals, and storage components.SaaS APIs connect the application layer with the cloud and underlying IT infrastructure, such as CRM and ERP applications. IaaS APIs help control specific cloud resources and their distribution, such as the rapid provisioning or de-provisioning of cloud resources, network configurations, and workload management. Cross-platform and cloud provider APIs allow for greater cross-platform compatibility and provide the ability to access resources from multiple cloud providers and platforms, saving time and development effort.

Web API development

Web API development

Web API is a set of Hypertext Transfer Protocol (HTTP) request messages. Building Web APIs, we use latest representational state transfer (REST) and resource-oriented architecture (ROA) styles. We also create mashups and web APIs for social media.

API Integration

API Integration

API integration means setting smooth communication between diverse software components, technologies, and programs: medical software integration, integration with Google, Yahoo!, PayPal, Amazon, Skype, Facebook and Twitter; integration with JS, XML, RESTful APIs; integration with Oracle web services and much more.

API consulting

API consulting

We will analyze your current processes and architecture, help you develop a strategy and a plan, identify and eliminate issues before they become real problems. With extensive experience, we will also help you make the right choice of API management and API integration solutions that will meet all your needs. Our recommendations are developed based on rigorous analysis, taking into account code, processes, security and architecture.

Successfully build APIs of high performance

We successfully build APIs of high performance and security for any industry and right for your specific requirements. Our developers use modern methods to provide data processing in different programming languages. We orient on your needs and always meet customers’ expectations.

Contact us today to get professional IT consultation on your API development/integration idea.

Our API specialists, who have extensive experience in providing API development and integration services, using C, C++, Java, Python, and PHP, create powerful, secure, and easily maintainable APIs.

API Integration Services

Integrating an API can help quickly and cost-effectively develop products or implement new features, and seamlessly interface with other systems. With our help, you can implement or connect internal and external API services for mobile, platform, or web apps.

Custom API integration

A custom API is necessary when a suitable ready-made API is not available or does not fit your needs. A custom API allows for sharing your product data and capabilities. Our expert developers will bridge the gap between your platform or app and the critical information and data you need to succeed. With our secure API communication, you can rest easy knowing your business is in good hands. We will help you find, develop, or review the API services for your unique needs. We're experts in various API services including REST and GraphQL and we've got experience in programming high-speed, large-scale API projects.

E-commerce API Integration

Our API experts help you synchronize your e-commerce services with inventory management systems, product feeds, order management, international shipping, gift card loyalty services, ERP/CRM systems, cart management and more. You can connect your app to external services, take orders with custom payment gateways, share sales data with your accounting system, send orders to your warehouse for fulfillment, provide chat and support tickets, track deliveries in real-time, integrate with Google and Apple services, and synchronize your retail POS customers. We can help expand your e-commerce capabilities to support platforms such as Shopify, Magento, and more.

CRM API integration

By utilizing a CRM API, sync all information into one central location, eliminating issues of multiple data sources. Get the ability to manage leads directly from your email, like Gmail or Outlook, for more effective email marketing and to not miss important notifications. Syncing your web-based calendar with your CRM ensures that you stay up-to-date and never schedule a call with a sales prospect in your CRM and forget to add it to your calendar. Connect platforms like Facebook, Instagram, Twitter, and LinkedIn to your CRM. Sync data gained from surveys (like SurveyMonkey and Typeform) with the contact data in your CRM. Integrate your CRM with communication platforms like Slack, Microsoft Teams, Zoom.

ERP API integration

APIs help you extend the functionality of your ERP system and get more value from your ERP investment. Third-party vendors provide APIs to enrich ERP data. Examples of these features include: communication with mobile applications; integration with e-commerce platforms to automate inventory management, order tracking, shipping and more; accurate and synchronized inventory data across all sales channels; automatical orders import and insert shipping tracking information into e-commerce stores; dashboard visualizations for business intelligence, analytics and reporting for a comprehensive view of business operations and resource allocation.

Logistics API integration

It's vital for third-party logistics companies to provide information exchange between shippers and carriers, and to connect them with cloud providers. APIs, such as JSON or XML, allow for seamless integration with ERPs, TMS, WMS, and finance systems. Replace the EDI-based load-tender-to-invoice process with real-time APIs, get real-time updates on location and route tracking through connections with electronic logging device aggregators and visibility providers, access accurate spot rate information, automate freight matching, determine cost-effective routing options, integrate back-end applications, such as SaaS and legacy systems, into supply chain processes.

Payment API integration

API-based payment integration can greatly enhance the checkout experience for both merchants and customers. Payment APIs enable businesses to seamlessly incorporate payment processing capabilities into their existing software and mobile apps. With payment APIs or payment API gateways, eCommerce and retail vendors can issue refunds for online payments, enable recurring payments for subscription-based or SaaS businesses, integrate various local and global payment options, track orders and access real-time data on transactions, and easily reach customers in international markets.

What is API

Application Programming Interface
API (Application Programming Interface) is a set of certain protocols, specific standards, and tools, which are used by a programmer to integrate different applications. APIs enable access to another app or platform. Due to APIs, applications can interact with each other. Use of API not just simplifies programming, but it also enhances user experience, increasing the popularity of your application and facilitating user’s control over different applications. Today, all advanced applications are being improved by specialized APIs.
Social media API integration

There are different types of APIs. They vary depending on what programming language is used – procedural, object-oriented etc.: for applications (Google Maps API, Facebook API, Twitter APIs, LinkedIn API); for a web-based system or a website (Amazon, eBay); for operating systems (POSIX is for Linux and Berkeley Software Distribution, Microsoft Windows API); for a database system; for computer hardware; for a software library.

Also, there three main policies for releasing APIs: private (for internal use), partner (for business partnerships), and public (for public use).

API’s design

As for API’s design, it aims at providing only those tools, which end users expect. The principle of information hiding is used here not to bother users with unnecessary for them complex implementation details.

Each API goes with documentation where all the information on what the services API offers and how to use them is given. API documentation is also necessary for developers because it includes the description of classes and methods, typical usage scenarios, code snippets etc.

The Business Benefits Of Using APIs

The Business Benefits Of Using APIs

Integration with third-party apps, which provide real-time functionality or manage computations, without needing to write your own complex algorithms (this is true for e-commerce, finance and other industries).

Empower your lead generation or CRM apps with social insights (by matching email addresses against social media profiles).

Integration web/mobile apps with a cloud storage of files.

Integration mobile apps with a remote backend to push files and retrieve data.

API integration


API Integration for Digital Transformation of a Freight Management Company
API Integration for Digital Transformation of a Freight Management Company
Our Client, a US-based freight management company, needed a custom core business app to optimize their workflows.
100+ API Integrations for Data Security Management Company
100+ API Integrations for Data Security Management Company
Our Client, the US data management company that sells software for managing sensitive and private data in compliance with regulatory laws, needed skilled developers for building API integrations to the custom software.
Mobile Applications for a Sports IoT devices Manufacturer
API to connect IOS and Android Apps to backend services (AWS database/IoT)
Our client is a successful manufacturer of an innovative sports IoT device named Sportstation. We developed IOS and Android applications which can communicate with it. We also made Integration with several third-party systems, e.g. with the system of the children’s football camp of Real Madrid.
Instant Payment App Development for Mobile Banking
Open Banking API Gateway Platform for a fintech startup
Belitsoft was contacted by the founders of a startup from one of the EU Member States. They wanted to create a mobile app that would support SEPA Instant Credit Transfer (SCT Inst) scheme to make real-time payments.
Customization of ready-to-use InsurTech Software for individual needs of particular insurance organizations
Microservice-based APIs for a large product company
Our client is a global insurance custom software development company (1.6M+ EUR in revenues in 2016) with the teams in the USA, the UK, Estonia, Latvia, Lithuania, and Poland. The Client asked us to enlarge his team with dedicated software developers to speed up the process of maintaining his system and adding new complex custom features to it.
Sports Team Communication App Development
Full Stack API Development
A convenient platform for sports clubs, amateurs, and professionals.

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USA +1 (917) 410-57-57

UK +44 (20) 3318-18-53

Israel +972 53-337-9957

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