home / services / web development / integrations & api
// back-end web development
Custom HubSpot integrations: connect your tools and synchronize your data
Data serving your website and your CRM on HubSpot.
Would you like to integrate HubSpot with third-party tools?
if/else agency’s developers build custom HubSpot integrations to connect your tools and automatically feed your analytics, your CRM and your website.
// at a glance
- lead time
- A few days
- flows
- One-way or two-way
- security
- HTTPS, OAuth 2.0, encryption
- ownership
- Your tools, no lock-in
// references we are proud of
// 01 · custom connectors & api development
Why consider developing an API or a custom connector on HubSpot?
- Case 1: native integrations don’t go far enough because your needs are very specific.
- Case 2: the available apps are not the ones you use every day.
- Case 3: you have very specific business needs that require a fully custom synchronization.
In a few days, the if/else agency team can develop secure applications that connect your software to HubSpot and synchronize your data automatically, in both directions.
Automate quote creation
Depending on how your deals progress in the CRM, we can run code from a workflow to generate quotes automatically.
Data migration
From one HubSpot account to another, or from a third-party CRM to HubSpot, we help you migrate your data cleanly and without loss.
Customer portal and dedicated data
Retrieve your customers’ invoices to display them in a space dedicated to them, or manage the upload of the supporting documents that make up their file? It’s possible on HubSpot.
Custom ETL
We can develop an ETL (Extract, Transform, Load) to collect your data from different sources, transform and structure it, then load it into your CRM according to your rules and business needs.
Locator
Do you have several locations? Are your services or products spread across different areas? By synchronizing your tools with HubSpot, we can build an interactive map on your website that dynamically displays your offers, wherever they are.
Public data
Want to use public data on your website or in your CRM? We connect HubSpot to external sources, process and normalize the data you need, then integrate it cleanly into your CRM and/or your website.
// 02 · our method
The steps of a robust HubSpot integration to synchronize your data
Our method to connect your tools, orchestrate your data and secure your flows on HubSpot.
Projects involving API integrations and data synchronization between several tools can quickly become complex. To run them efficiently, we rely on a clear, proven methodology. At if/else agency, we analyze your needs, design the architecture of your data flows, then build reliable integrations so that your systems communicate simply and durably with HubSpot.
01
scoping
Scoping workshops
We run workshops with your teams to analyze your existing architecture, your tools and your data flows. This phase lets us identify your needs and define the most suitable technical solutions to integrate and synchronize your systems with HubSpot.
02
design
Designing the use cases
Together, we define the different synchronization and integration scenarios as diagrams and data flows. This modeling lets us validate the architecture and the operating rules before development starts.
03
development
Developing the integrations
We develop the API connections, HubSpot workflows and synchronization mechanisms needed to connect your tools. Each integration is designed to provide reliable, automated data flows suited to your business processes.
04
go-live
Testing and go-live
We test the integrations in real conditions with your teams to check that flows and synchronizations work properly. Once everything is validated, we deploy the solution to production for stable, secure operation.

// 03 · use your data and the hubspot apis
How to display, synchronize and structure your data in HubSpot
Generate dynamic pages from your data on HubSpot
Synchronized HubDB tables and CRM objects to automate your content management.
To deploy dynamic pages or directories on HubSpot, our teams create, depending on your needs, HubDB tables or custom CRM objects fed with your own data. These structures are then synchronized with your existing tools or databases to automate data entry and become the single source of truth for your content.
Each new entry automatically generates a page and each update is reflected in real time. You get dynamic pages that are always up to date and fully aligned with your data.
The result: less manual work, more reliability, scalability and efficiency.

// 04 · automated data flows
Automate the synchronization of your data with HubSpot
Automated data flows between HubSpot and your business tools.
From a trigger defined in HubSpot (webhook), we retrieve the data to synchronize, structure it (ETL), then send it automatically to your third-party tools.
In short: we configure workflows that trigger, format and send your data to your business tools automatically.
if/else agency sets up reliable two-way (or one-way) flows so that your systems communicate with each other, with no manual re-entry and no data loss.
// faq · hubspot integrations & back-end
Frequently asked questions about custom HubSpot integrations
API synchronization connects HubSpot to other tools (CRM, ERP, customer support, etc.) to share and update data automatically between your systems. It ensures all your teams work with the same up-to-date information, without manual intervention.
You can connect a wide variety of tools to HubSpot: CRM, ERP, invoicing tools, customer support, marketing platforms, etc. Synchronization depends on the APIs available in these third-party tools and on their compatibility with HubSpot.
Common data includes:
- Contacts: customer information, leads, segments.
- Transactions: deals, sales, opportunities.
- Events: interactions, support tickets, engagement history.
- Custom data: any information specific to your company (products, orders, etc.).
Yes, synchronization can run in real time or at set intervals, depending on your business needs. This lets you react quickly to changes and automate your workflows.
Yes, security comes first. We use HTTPS protocols, OAuth 2.0 authentication and encryption mechanisms to guarantee the confidentiality and integrity of data during transfer.
Yes. Every integration is delivered with its documentation: data flow diagram, synchronization rules, the endpoints used and what to do if an error occurs. The code belongs to you and your team can maintain it without us.
We only synchronize the data your processes need, and only between the tools that need it. Access goes through dedicated keys and permissions, exchanges are encrypted, and HubSpot lets you host your data in Europe. We document every flow to make your record of processing activities easier to keep.
Yes, API integration usually requires technical skills, especially for custom work. If you already have a development team, if/else agency can act as HubSpot technical consultants to train, guide and secure their technical choices within your new HubSpot ecosystem. If you don’t have an in-house team, we can handle the API development and integration according to your needs.
Absolutely. HubSpot has native connectors for some popular tools, but even for more specific or proprietary systems, we can develop custom APIs to ensure smooth synchronization.
If you wish, we can provide ongoing support to solve any synchronization issue, in particular by setting up a monitoring system that detects synchronization errors so we can step in quickly to fix them.
API synchronization lets you:
- Avoid human errors from manual entry.
- Save time by automating data updates.
- Make your teams more efficient with consistent, real-time data.
- Offer a better customer experience thanks to automated processes and always relevant information.