Systems that talk to each other directly
An API is a contract between systems: it defines what data can be read or sent and how. A well-designed API lets you connect a store, a mobile app, an ERP system or a partner’s platform without moving data by hand — and without rebuilding each of those systems.
We design and build APIs for web and mobile applications, B2B platforms and integrations with external services. We make sure they are secure, predictable and well documented, because other teams and partners will use them too. Ready-made connections with stock-management and accounting software are described on the ERP integrations page.
What we do
REST and GraphQL design
We design resources, endpoints and data formats according to standards, so the API is easy to use.
System integrations
We connect stores, applications, ERP systems and external services into a coherent ecosystem.
Documentation
Every API comes with clear documentation and examples that make integration easier.
Security and authorisation
We use proven mechanisms, including OAuth and JWT tokens, together with data access control.
Performance and scalability
We design APIs for growing traffic: pagination, caching and rate limits.
Support and development
We develop the API, version changes and keep it compatible with existing integrations.
What businesses use APIs for
An API is useful wherever the same data is needed in several places, or when other companies need to work with your system.
Mobile apps
A shared back end for iOS and Android apps and your website.
Partners and B2B
Access to the offer, prices, stock and orders for trade partners and sales networks.
Store and company systems
Exchanging orders, stock levels and documents between the store and the ERP or warehouse.
External services
Connections with payments, couriers, marketplaces and marketing tools.
Automation and webhooks
Event notifications that trigger actions in other systems.
Reports and data
Providing data for analysis and data warehouses without manual exports.
How the process works
1
Needs analysis
We learn which systems need to communicate and agree on the data and operations required.
2
API design
We design resources, data formats, authorisation and error handling, and agree on the design before development.
3
Implementation
We build the API according to the design and prepare a test environment for integrators.
4
Testing
We check correctness, performance and security, including behaviour with invalid data.
5
Documentation and support
We hand over the documentation, help with the first integrations and keep developing the API.
How much does building an API cost?
The cost depends on the scope and requirements. The estimate is influenced by:
- the number of resources and operations the API should expose,
- the complexity of the logic and data access rules,
- security and authorisation requirements,
- expected traffic and performance requirements,
- the scope of documentation and support for integrators.
We prepare the estimate after analysing your needs and build larger APIs in stages. Request an estimate or get in touch.
Why Appinet
We build APIs that follow standards and are easy to integrate and maintain — whoever ends up using them. We connect stores, applications and company systems every day, so we know the problems that arise on both sides of an integration and design APIs to avoid them.
Frequently asked questions about APIs
REST or GraphQL?
REST works for most integrations and is well known to partners. We choose GraphQL when API clients — such as mobile apps — need to fetch different sets of data flexibly. We advise after analysing your needs.
How do you secure the API?
We use authorisation such as OAuth and JWT tokens, data access control, encrypted connections and rate limits.
Will we get documentation?
Yes. Every API comes with documentation describing the resources, data formats, authorisation and usage examples.
Will changes to the API break existing integrations?
We use versioning and keep backward compatibility. Changes that require integrations to be adapted are announced in advance.
Can you connect to another system’s API?
Yes. We integrate with the APIs of external services and company systems, and when there is none, we propose other ways of exchanging data.
Will you look after the API after launch?
Yes. We monitor it, fix bugs and extend the API with new capabilities.
Related services
- ERP integrations — connections with stock-management and accounting systems.
- Web applications — the systems we build APIs for.
- Mobile applications — apps that use your API.
- Laravel applications — the technology we build APIs with.
- PrestaShop integrations — connecting the store with other systems.