API Integrations

API integrations — connect the systems that off-the-shelf plugins and integrators do not support

We build dedicated API integrations that connect your website, store, CRM, ERP, web application, warehouse system, database, customer panel or an external tool with your other company systems.

If a ready-made plugin, Zapier, Make or a standard n8n node is not enough — we prepare an individual connection through the API. Data can be fetched, sent, synchronised, validated and processed exactly according to your business logic.

It is not just about “plugging in an API”. The goal is a stable flow of data that reduces manual work, lowers the number of errors and lets you automate processes that off-the-shelf tools cannot handle.

Node.js, PHP, Python
REST + SOAP + GraphQL
OAuth, JWT, API Key, custom auth
Webhooks + retry + idempotency
Monitoring + logs + alerts
Code in Git — no vendor lock-in

Ask about an API integration See the packages

An API integration is your situation if

you have your own CMS, CRM, ERP, customer panel or web application
the system has no ready-made integration with WordPress / WooCommerce / BaseLinker / n8n / Zapier / Make
the off-the-shelf integration transfers too little data
you need custom field mapping
data must be processed before it is saved
the integration requires OAuth, JWT, an API Key or custom auth
you want to combine several data sources into one process
you need logs, alerts and error control
you want to keep the integration code on your side
you care about a solution that does not lock you into a single SaaS platform

What does an API integration give you?

Five concrete benefits that off-the-shelf plugins and standard integrators do not provide.

You connect systems that normally do not work together

If two tools have no ready-made integration, they can be connected directly through the API. This is especially true for bespoke systems, older ERPs, industry-specific applications and unusual processes.

You cut down on manual data re-entry

Data moves automatically between systems: customer, order, product, invoice, document, status, report, ticket, payment or the result of a query.

You keep your own business logic

Off-the-shelf integrators often impose limitations. A dedicated API integration lets you set your own rules: when to fetch data, how to process it, which fields to synchronise and what to do on error.

You have greater control over your data

An integration can include logs, alerts, error handling, retry, documentation and monitoring. You know what the system did, when and with what result.

You avoid vendor lock-in

You receive the full integration code in a Git repository and can hand it over to other developers. You are not tied to a single provider or a single SaaS platform.

What problem do API integrations tackle?

Off-the-shelf integrations are convenient, but they have limitations. They often work only in simple scenarios: fetch data, send data, change a status. The problem starts where a company needs something more specific.

the external system has no ready-made connector

the ready-made plugin does not support the endpoint you need

data has to be transformed before saving

the API requires unusual authentication

the process must run according to individual conditions

you need to combine several data sources

the integration must run on a schedule or in real time

you need to control errors and record logs

data cannot be sent through random intermediary tools

A dedicated API integration lets you build a connection matched to the company’s real process. The system does not work “the way the plugin allows”, but the way the business requires.

An API, n8n or a ready-made plugin?

You do not always need to write dedicated code straight away. Sometimes a ready-made plugin is enough, sometimes n8n, and sometimes a dedicated API integration is essential.

Technology	When it makes sense	Limitations
Ready-made plugin	the process is standard, the integration is popular and well maintained, the data is simple, there are no custom rules	accepting the limitations of an off-the-shelf solution
n8n	you need to connect several tools, the process needs conditions and simple transformations, the integration should run as a workflow, you want fast delivery	less control over the logic than with a custom API, node limitations
Dedicated API	an unusual or poorly supported API, full control over the logic, custom auth, many endpoints, data validation and transformation, logs/monitoring/retry, no vendor lock-in	higher upfront cost and a longer delivery time

What can we integrate through an API?

Six areas of dedicated integration — from stores and CRMs, through web applications and customer panels, to external registries and production webhooks.

Online store ↔ external system

fetching products
price updates
stock synchronisation
passing orders through
status updates
fetching documents
contractor synchronisation
data validation before saving

Benefit: The store runs on up-to-date data from the master system, and the team does not update information by hand.

CRM and forms

sending leads to the CRM
creating contacts
assigning leads to sales reps
fetching statuses
updating customer data
creating tasks
automatic notifications

Benefit: Leads reach sales faster and do not get lost in an inbox.

Finance, invoicing and accounting systems

issuing an invoice after an order is paid
passing contractor data through
fetching the payment status
saving a PDF document
sending the invoice to the customer
passing data to accounting

Benefit: Less manual document issuing and a lower risk of mistakes.

Web applications and customer panels

fetching data from an external system
sending orders or tickets
status synchronisation
creating user accounts
data verification
generating documents
fetching reports

Benefit: Your company app exchanges data with the rest of the systems instead of working as an isolated island.

Public data and external registries

fetching data from registries (GUS, BIK)
verifying a contractor
checking the status of data
auto-completing forms
fetching reports on a schedule
combining data from several sources

Benefit: The company uses external data without manually checking multiple systems.

Webhooks and production automations

receiving events from external systems
queuing and retry
signature validation
operation idempotency
writes to a queue / database
failure notifications

Benefit: The integration reacts to events instantly and does not lose data during temporary outages.

What does the API integration package include?

Thirteen elements of the delivery — from API documentation analysis to post-deployment support.

Element	What we do	What the client gains
API documentation analysis	We check the endpoints, limits, authorisation and the system’s capabilities	You know whether the integration is possible and what its scope is
Architecture design	We establish how the systems should communicate	The integration has a clear plan before development starts
Field mapping	We define which data should move between systems	Fewer errors and data inconsistencies
Authentication	We configure OAuth, JWT, an API Key or custom auth	The system communicates securely
Connector implementation	We build the integration code in Node.js, PHP or Python	You get a solution matched to your process
Data transformation	We validate, map and process data before saving	Data reaches the system in the correct format
Error handling and retry	We design reactions to API errors, limits and missing data	The integration does not stop without notice
Operation logging	We record the actions performed and the systems’ responses	You can check what happened
Monitoring and alerting	We set up notifications about problems	The team reacts to failures faster
Integration testing	We test the integration on real scenarios	A lower risk of errors after deployment
Technical documentation	We describe how it works, the endpoints, the logic and maintenance	The integration can be developed and handed over to another developer
Git repository	We hand over the source code	No dependence on the provider
Post-deployment support	We help stabilise and improve the integration	A safer production launch

Example API integration scenarios

Five concrete processes that we most often build as part of dedicated API integrations.

WooCommerce → ERP → warehouse

A customer places an order in the store
The integration passes the data to the ERP
The ERP returns the order acceptance status
The system updates the status in WooCommerce
Stock levels synchronise with the master system
Errors are sent to logs and alerts

Benefit: The store and the warehouse work on consistent data — staff do not re-enter orders by hand.

Web form → external API → CRM

A user fills in the form
The system validates the data
The integration sends a request to an external API
The API response is processed
The data reaches the CRM
A sales rep receives a notification

Benefit: The lead is automatically enriched with external data and reaches sales faster.

CRM → invoicing system → PDF

A customer’s status changes in the CRM
The integration fetches the contractor data
The data is validated
The system issues a sales document
The PDF is saved in the customer’s folder
The customer receives a message with the document

Benefit: Less manual administration and a more consistent document flow.

Web app → several external APIs

A user performs an action in the app
The system fetches data from several sources
The data is combined and normalised
The result reaches the user panel
The operation is recorded in the logs
Errors trigger an alert for the administrator

Benefit: The app uses many data sources within one orderly process.

Webhook → n8n → API → database

An external system sends a webhook
n8n receives the event
The API integration fetches additional data
The data is validated and processed
The result is saved to the database or CRM
The team receives a notification that the process is complete

Benefit: We combine the flexibility of n8n with dedicated API logic.

The most important decisions before an API integration

Five questions that determine whether the API integration will be stable and predictable in production.

Which data should be synchronised?

Customers, orders, products, prices, stock levels, invoices, statuses, documents, tickets, reports, payments — you need to clearly define what data moves between systems.

Effect: The integration has a defined scope, not “everything that is possible”.

Which system is the source of truth?

Prices — the ERP. Products — the PIM or the store. Stock — the warehouse. Orders — the store. Customer data — the CRM. Invoices — the accounting system. Statuses — the operational system.

Effect: Without this decision, the integration may overwrite data or create conflicts.

In which direction should the data flow?

An integration can be one-way or two-way: store → ERP, ERP → store, CRM → invoicing, form → API → CRM, warehouse → store, external system → app, app → external system.

Effect: Two-way synchronisation requires especially precise rules for conflicts and the order of operations.

Should the process run in real time, on a schedule or manually?

After an event, via a webhook, every few minutes, once a day, on a schedule or after being run manually. A lead — quickly. A financial report — once a day.

Effect: Matching the frequency to the process, not to the technical possibilities.

What do we do on error?

Missing required data, an incorrect response format, an unavailable API, an exceeded request limit, an authorisation error, a duplicate record, a data conflict, a timeout, a change in the API response structure.

Effect: The system records a log, performs a retry, sends an alert or passes the case to a human.

Security and maintenance

An API integration must be secure, testable and maintainable

API integrations process customer data, orders, documents, access tokens, financial data and information from internal systems. The delivery should cover not only the code, but also security, monitoring and maintenance procedures.

secure storage of API keys
support for OAuth, JWT, an API Key or custom auth
restricting the scope of permissions
input data validation
operation logging
error alerts
retry and timeout handling
technical documentation
version control in Git
integration tests
an update plan for when the external API changes

The client buys not just “code”, but predictability and the ability to keep maintaining the integration — including by another developer.

What do you get after deployment?

Six tangible elements delivered once the API integration project is complete.

A working API integration

A ready connection between systems, tested on agreed scenarios and prepared for production work.

Source code in a repository

You receive the integration code in GitHub, GitLab or Bitbucket — you are not tied to a single provider.

Technical documentation

We describe the endpoints, authorisation, data mapping, integration logic, error handling and the way it is maintained.

User documentation

A simpler description for the people using the process: what the integration does, when it runs, where to check the status and what to do on error.

Monitoring and alerts

The integration reports problems: an unavailable API, a save error, missing data, an authorisation error, a failed synchronisation.

Post-deployment support

We watch how the integration behaves on real data and fix the scenarios that could not be fully anticipated in testing.

How much does an API integration cost?

The price depends on the number of endpoints, the authorisation method, the number of systems, the scope of data mapping, the transformation, error handling, monitoring and testing.

API Start

A simple connection between one system and another

from 2,500 PLN net

For companies that need a simple connection: sending data from a form, store, CRM or app to one external system.

Who it is for

one endpoint
standard authorisation
simple data
model validation
an integration PoC

Scope

API documentation analysis
one main endpoint
basic fetching or sending of data
simple field mapping
basic data validation
a functional test
short documentation

What you gainYou test the integration in practice — without the risk of a larger investment.

An extended production integration

from 5,000 PLN net

For companies that want to automate a real process, not just send a single record — with several endpoints, data transformation and error handling.

Who it is for

5+ endpoints
data transformation
error handling + retry
logs and basic monitoring
a real business process

Scope

API analysis on both sides
up to 5+ endpoints
data mapping and transformation
data validation
error handling
retry
operation logging
integration tests
technical documentation
post-deployment support

What you gainThe integration handles a full business process, not a single operation.

API Advanced

A complex production integration

from 10,000 – 15,000 PLN net

For companies that need a stable integration handling a key business process — with custom auth, monitoring, multiple systems or real-time operation.

Who it is for

a key company process
OAuth / JWT / custom auth
many endpoints + webhooks
real time or a complex schedule
high production requirements

Scope

integration architecture design
custom authentication, OAuth or JWT
many endpoints
webhooks
real-time synchronisation or a schedule
API limit handling
monitoring and alerts
technical logs
edge-case tests
developer documentation
a Git repository
a maintenance plan
post-deployment support

What you gainAn integration ready for production — with a plan for years, not just the first week.

Prices are net — add 23% VAT. Architecture consultation 1–2 h: 290–490 PLN net. Updating the integration after the external API changes: roughly 20–50% of the original value.

What does an API integration delivery look like?

Seven stages — from API documentation analysis to handing over the repository and post-deployment support.

We analyse the API and documentation

We review the technical documentation, endpoints, authorisation, limits, data structure and constraints. If the documentation is incomplete, we run tests on a sandbox/test environment.

Effect: You know whether the integration is possible, what its scope will be and where the risks are.

We design the integration architecture

We establish which systems need to communicate, what data will be transferred, in which direction, how often and according to what rules.

Effect: The integration has a logical plan rather than being written “by feel”.

We map and validate the data

We define the field equivalents between systems. We establish how to handle missing data, incorrect formats, duplicates and unusual cases.

Effect: Data reaches the right place and in the correct format.

We implement the API connector

We build the integration code in Node.js, PHP or Python — depending on the stack and the requirements.

Effect: A dedicated connection is created, matched to the company’s specific process.

We test the integration

We check correct scenarios, errors, missing data, limits, timeouts, API responses, duplicates and edge cases. Testing also covers “what happens when something goes wrong”.

Effect: A lower risk of failure after the production launch.

We deploy and set up monitoring

After testing we deploy the integration to production and configure logs, alerts and the way errors are handled.

Effect: The integration runs in a real process, and the company can see whether the operations are correct.

We document and hand over the project

We hand over the documentation, the code repository and an operating guide. The integration is not a “black box”.

Effect: The project can be developed, maintained and handed over to another technical team.

Frequently asked questions

Can every API integration be built?

Not always. First we need to check whether the system exposes an API, what endpoints it offers, its limits, authorisation and documentation. If the system does not allow you to fetch or send the data you need, the integration may require a workaround or be impossible within the expected scope.

Will an API integration replace Zapier, Make or n8n?

It can, but it does not always have to. Zapier, Make and n8n are good for many standard processes. A dedicated API integration makes sense when off-the-shelf tools are too limited, there is no connector available, you need custom authorisation, or the process requires bespoke logic.

Will I get the source code?

Yes. We hand over the full integration code in a Git repository (GitHub, GitLab or Bitbucket). This means you are not tied to a single provider and can develop the project in the future with another team.

What happens if the external API changes?

The integration may need updating. Providers usually announce changes in advance. Adapting the integration to a new API version costs roughly 20–50% of the original integration value — which is why monitoring, documentation and a maintenance plan matter.

How long does an API integration take to deliver?

A simple integration: 2–3 weeks. A medium one: 4–6 weeks. A complex production integration: 6–10 weeks. The timeline depends on the quality of the API documentation, the number of endpoints, the testing and the availability of a test environment.

Can I just get an API consultation?

Yes — we offer a 1–2 h architecture consultation for 290–490 PLN net. It is a good starting point for companies that do not yet know whether they need a dedicated API integration, n8n or a ready-made plugin.

Can an API integration run on a schedule?

Yes. An integration can run on a schedule (every few minutes, once an hour, once a day) or based on an event (a webhook, a new order, a status change, a user action).

Can an API integration be two-way?

Yes, but it requires precise rules. You need to decide which system takes priority, what to do in the event of a data conflict and how to avoid systems overwriting each other’s information.

How does an API integration differ from a ready-made plugin?

A ready-made plugin works according to predefined features. An API integration can be designed individually: with its own logic, data mapping, validation, error handling, monitoring and alignment with your business process. It is usually more expensive than a plugin, but gives you greater flexibility and control.

Got a system that can’t be connected with a ready-made plugin?

If you use your own CRM, ERP, customer panel, web application, warehouse system, external API or a tool that no ready-made integration supports — we can design a dedicated API connection.

We start by analysing the documentation and checking whether the integration is possible, what its scope will be and whether a custom API, n8n, a ready-made plugin or a simpler automation is the better solution.

Send us the API documentation or describe the systems you want to connect — we will work out the best way to deliver the integration.

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