HubSpot's API covers contacts, companies, deals, tickets, and most of the data a business keeps in its CRM, reachable through a private app token or a full OAuth app depending on what you're building. It's a genuinely capable API, which is exactly why we build most of our HubSpot integrations straight against it instead of routing everything through a point-and-click connector.
Private apps are the normal starting point. For a single integration that doesn't need to be installed by other HubSpot accounts, a private app gives you a scoped API token in a few clicks, no OAuth redirect flow required. That's enough for most of what we build: reading and writing contacts, companies, deals, and tickets, and firing off the custom objects a business has defined for itself.
OAuth matters once an integration leaves your own account. Building something that connects to other people's HubSpot portals, not just your own, means going through HubSpot's OAuth flow and requesting the specific scopes that integration needs. More setup, but it's what a real multi-tenant integration requires.
Custom objects and properties are fully reachable. If a business has extended its CRM with its own object types or custom fields, the API reads and writes those the same way it reads and writes a standard contact or deal, which matters a lot once a HubSpot setup has grown past the default data model.
The API is generous with data. It's much less generous with workflow logic. You can enroll or unenroll a record in a workflow that already exists, and a custom-coded workflow action can call your own endpoint mid-workflow, but there's no API to create or edit a workflow's actual branching logic the way you'd build it in HubSpot's own visual editor. That part stays a UI-only feature, tier-gated besides.
That's usually where we come in: either we build the custom-code action a workflow calls out to, or we skip HubSpot's workflow engine entirely and drive the same logic from outside, triggered by the same webhook or API event, when what a business needs doesn't fit what the visual builder can express.
Deals, contacts, and custom objects kept in sync with QuickBooks, NetSuite, or whatever system actually owns the data HubSpot doesn't, built straight against the API instead of a generic connector's lowest-common-denominator mapping.
A custom-coded action that calls our endpoint mid-workflow, so the logic HubSpot's visual builder can't express still runs at the right point in the sequence.
Tell us what you're trying to connect and we'll get the access configured correctly before writing a line of integration logic.
Tell us what you're trying to move in or out of HubSpot, and whether it's a data problem or a workflow-logic problem, those take different fixes. We'll scope the real work, API access setup included.
Let's talk →Yes. HubSpot's API covers contacts, companies, deals, tickets, and custom objects, accessible through a private app token for single-account integrations or a full OAuth app for integrations that connect to other accounts.
A private app issues a scoped token for integrating with your own HubSpot account specifically, set up in a few clicks. A public OAuth app goes through HubSpot's OAuth flow and requested scopes, built for integrations that need to connect to other people's HubSpot accounts, not just your own.
No. The API can enroll or unenroll records in a workflow that already exists, and a custom-coded action can call an external endpoint mid-workflow, but creating or editing the workflow's branching logic itself is a UI-only feature with no API equivalent.
Yes. Custom objects and properties a business has defined are reachable through the same API endpoints as standard objects like contacts and deals.
To read or sync basic data, not necessarily, some no-code tools handle simple cases. To build anything with real logic, a two-way sync, a custom workflow action, error handling that actually recovers, yes, that's a real integration and takes someone who can build to the API directly.