API development and third-party integrations for websites and web apps
A website that cannot talk to your other systems creates work rather than saving it — someone retypes every enquiry into the CRM and reconciles orders by hand. We build the connections that remove that step, whether that means consuming a third-party API, exposing your own, or wiring a Bubble.io backend to a marketing front end.
Included as standard on every engagement — not an upsell list.
Third-party API integration
CRM and marketing platforms, payment gateways, booking and calendar systems, accounting tools, shipping and inventory feeds, SMS and email providers. We read the vendor documentation properly, handle authentication and rate limits correctly, and map fields to your real business data rather than a demo schema.
Custom endpoints on your own site
Where another system needs to read or write your data we build authenticated REST endpoints — WordPress REST API routes or Bubble Data and Workflow API calls — with validated inputs, permission checks, sensible status codes and predictable JSON shapes your partner developers can work against.
Data mapping and transformation
The unglamorous work that decides whether an integration survives: matching field names, normalising dates, currencies, phone formats and country codes, deduplicating records, and deciding which system is authoritative when two of them disagree about the same customer.
Reliable sync with retries and idempotency
Networks fail and vendors have outages. We queue jobs, retry with backoff, make writes idempotent so a retry cannot create duplicate orders or contacts, and log every exchange so a failed sync can be traced and replayed instead of silently disappearing.
Webhooks in both directions
Real-time updates rather than hourly polling: verified inbound webhooks from payment and booking providers, and outbound webhooks that notify your systems when a form is submitted, an order is paid, or a record changes. Signature verification and replay protection are handled properly.
Secure credential handling
Keys and tokens live in server-side configuration or environment variables, never in front-end code or a plugin setting exposed to editors. We scope credentials to the minimum permission needed and document the rotation process for the day a key has to change.
Monitoring, documentation and handover
Integration health checks with failure alerts, a written map of what talks to what, sample requests and responses, and a runbook for common faults. Your next developer should be able to understand the integration without reverse-engineering it.
How We Deliver It
Stage by stage, with the approval points marked. API Development & Integrations follows the same rhythm on every project.
01
Map the systems and the data
We start with the workflow, not the API: what event triggers the exchange, which system owns each field, what has to happen if the two disagree, and what genuinely needs to be real-time versus what can run on a schedule.
02
Review the API and prototype
We read the target documentation, confirm rate limits, sandbox availability and auth model, then build a small proof of concept against the sandbox to expose surprises early — undocumented required fields and pagination quirks always show up here.
03
Build with failure in mind
The production integration is written with validation, retries, idempotency keys, structured logging and graceful degradation, so an outage at the vendor slows the sync rather than breaking your checkout or contact form.
04
Test against real edge cases
We test duplicates, partial failures, timeouts, malformed payloads, expired tokens and out-of-order webhooks in staging before anything touches live data, and confirm the recovery path works as designed.
05
Deploy, monitor and document
Go-live is followed by a watching period with alerting on failed jobs, then handover of the integration map, credential inventory, sample payloads and troubleshooting runbook.
What You Receive
The concrete artefacts handed over at the end — files, access and documentation you keep.
Integration map showing systems, data flow direction and triggers
Field-level data mapping document with transformation rules
Working integration deployed to staging and production
Custom authenticated REST or Bubble API endpoints where required
Webhook receivers with signature verification and replay protection
Retry, error-handling and logging layer with an admin-visible log
Credential inventory and rotation procedure
Failure alerting on sync errors
Technical documentation with sample requests and responses
Ideal for
If two or three of these sound like your situation, this is the right place to start.
Enquiries from your site are being retyped into a CRM by hand
You need bookings or payments to flow straight into your back office
A partner or supplier has given you an API and nobody to implement it
Your Bubble app needs to exchange data with an external service
Reporting means exporting CSVs from three systems and merging them
An existing integration keeps failing silently and nobody can tell why
Tools we use
Standard, portable tooling. The licences, accounts and source stay in your name, so nothing here is a reason you cannot leave.
WordPress REST API
PHP
Bubble.io API Connector
Next.js
React
Node.js
Stripe
WooCommerce
Zapier
Make
Webhooks
JSON
OAuth 2.0
Postman
Work We Have Shipped
Live projects where this work did the heavy lifting:
LineaScore
Dynamic Reporting & PDF Platform
AI & SaaS ProductsHybridWordPress (landing)Bubble.io (app)Custom PDF generation
A WordPress marketing landing page paired with a full Bubble.io application on the app subdomain. The platform enables dynamic creation of configurable reports and includes a custom-built dynamic PDF generation feature that turns user inputs into clean, branded, downloadable documents in real time.
Marketplaces & DirectoriesBubble.ioBubble.io admin panelNative mobile app
A two-sided marketplace mobile app connecting people looking to update their hairstyle with the right hair professionals. The customer-facing mobile app is paired with a Bubble.io web admin panel for managing users, providers, listings, bookings and overall platform operations.
Healthcare & WellnessBubble.ioBubble.io admin panelNative mobile app
A healthcare mobile application paired with a custom Bubble.io web admin panel. The admin platform powers the operational backend for the BostMD product, managing users, content and workflows behind the consumer-facing app.
AI & SaaS ProductsBubble.ioMultiple AI/LLM integrationsGraph data display
A Bubble.io platform delivering affordable, on-demand technology research for R&D and innovation teams. Backed by a team of scientists and data engineers, it integrates multiple AI and LLM tools and presents findings through an interactive graph-based display of research data.
AI automation earns its keep inside the business, not on the marketing site. Here is where LLM-driven workflows genuinely pay off, how to scope the first one, and how to keep it accurate, reviewable and affordable.
n8n is the automation tool we reach for when a workflow has to survive contact with real production data. Here is how it is built, how to run it properly, and the operational details that decide whether your automations stay reliable.
Make.com and n8n solve the same problem with opposite philosophies: one is a polished hosted platform, the other is source-available software you can run yourself. Here is how we choose between them.
The questions we get asked most about API Development & Integrations.
Often, yes. If there is an API we can inspect — even an undocumented one used by the vendor’s own front end — we can usually map its behaviour, though we will be honest that unofficial endpoints can change without warning. Where no API exists at all, the realistic options are scheduled file or CSV exchange, or a middleware layer. We assess feasibility before quoting rather than after.
For low-volume, simple, one-directional flows they are excellent and we recommend them. Custom code earns its place when volume makes per-task pricing expensive, when the logic involves conditional branching or reconciliation, when data must be transformed in ways the no-code tool cannot express, or when a failure needs a proper retry and audit trail. We will tell you which side of that line you are on.
Credentials are stored server-side — environment variables or protected configuration outside the web root — never in JavaScript, theme files in version control, or a plugin field any editor can read. Calls are made from the server, scoped tokens are used where the vendor supports them, and we document rotation. If a key is exposed in a browser request, an attacker can use it as freely as you can.
Regularly. Bubble’s API Connector handles outbound calls to third-party services, and its Data and Workflow APIs let external systems read and write your app data. We have built AI and LLM integrations, payment flows and hybrid architectures where a marketing site sits in front of a Bubble application on an app subdomain, as with LineaScore.
Vendors deprecate versions, and it is one of the main reasons integrations decay. We pin to a specific API version where the provider supports it, monitor for failure patterns rather than assuming silence means success, and cover integration health in maintenance plans. When a breaking change is announced we schedule the update inside the deprecation window instead of discovering it the day the endpoint dies.
Ready to start on API Development & Integrations?
Send us the brief — or just the problem. You will get a written scope, a timeline and a fixed price, usually within one working day.