HubSpot integrations with your ERP and other systems

When HubSpot and your system of record disagree, sales works from the wrong numbers. I design and build the connection: what each system owns, what moves between them, and what happens when something fails.

Short answerDecide which system owns each piece of data, then build the flows around that ownership, with logging and safe retries. If your ERP has no API, the integration becomes an architecture decision, and I’ve built that version too.

What I connect HubSpot to

  • ERP systems: orders, invoices, pricing and inventory visible where sales works.
  • Accounting: invoices and payments tied back to the right company and deal.
  • Inventory and warehouses: stock by location, reservations and movements.
  • E-commerce and other tools: anything with an API or webhooks, plus systems that have neither.

Systems I work with

ERP and accountingNetSuite, Microsoft Dynamics 365 Business Central, QuickBooks, Sage, Zoho Books, ERPNext, Epicor Eclipse
E-commerceShopify
WorkplaceGoogle Workspace (Gmail, Calendar, Drive, Sheets), Microsoft 365 (Outlook, Teams, Excel, SharePoint), Slack
Marketing and callsGoogle Ads, Meta, CallRail
AIAnthropic’s Claude
Automationn8n, Zapier

Not on the list? If it has an API, webhooks or even a reliable export, it can usually be connected. Epicor Eclipse has no API at all, and I’ve still delivered two projects around it.

How I build integrations

  • Ownership first. Every record and field gets one system of truth, written down before any code.
  • One writer per balance. When several flows touch the same number, like stock on hand, one process writes it, so concurrent updates can’t corrupt it.
  • Safe to re-run. Loads are keyed on a unique ID, so a retry updates a record instead of duplicating it.
  • HubSpot’s real behaviour. For example, HubSpot webhooks can arrive in batches of up to 100 events in one request, and the flow has to handle every one.
  • An audit trail. Changes such as inventory movements go to an append-only ledger you can check later.

When the other system has no API

For a multi-location retailer replacing Epicor Eclipse, I built the ERP on top of HubSpot: 5 custom objects, 81 custom properties and 4 deal pipelines, with Postgres holding pricing rules and n8n as the only writer of inventory. Read the write-up.

For an equipment distributor on the same ERP, sales needed to place orders and see live inventory inside HubSpot, on a portal without serverless functions. I built a HubSpot module as the front end and a hardened Node service on the client’s own server behind it. Read the write-up.

Tools I use

HubSpot’s CRM API, custom objects and webhooks; n8n; Postgres; Node.js; and the APIs of whatever sits on the other side.

Common questions

Which systems can you connect to HubSpot?
ERP and accounting systems such as NetSuite, Microsoft Dynamics 365 Business Central, QuickBooks, Sage; Shopify; Google Workspace, Microsoft 365 and Slack; ad and call-tracking platforms; and AI models such as Anthropic’s Claude. Anything with an API or webhooks can be connected, and systems without one need a different design.
Can HubSpot integrate with an ERP that has no API?
Not directly. The options are to move the ERP’s job into HubSpot, to exchange files on a schedule, or to put a database and automation layer between the two. I’ve built the first of these for a retailer whose legacy ERP had no API: HubSpot as the system of record, Postgres for pricing rules, and n8n moving the data.
Should the integration be one-way or two-way?
Decide per field, not per system. A typical setup has the ERP owning inventory, pricing and invoices while HubSpot owns contacts and deal stages. Writing that ownership down before building is what stops the two systems overwriting each other.
Why not just use an off-the-shelf connector?
If a connector covers your data model, use it; it’s cheaper to run. Custom work makes sense when the connector can’t map your objects, breaks on your edge cases, or doesn’t exist for your system.
Where does a custom integration run?
Usually in n8n, self-hosted on your own server or on a hosted plan, or as a small service on infrastructure you control. The choice depends on your volumes and on who will maintain it after launch.

Have a system that needs to talk to HubSpot?

Book a free 30-minute call. Bring the messy version and I’ll help you work out what to fix first.

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