Procore API Integration Guide: Auth, Webhooks, and File Sync

The Procore API authenticates every request with OAuth 2.0 access tokens that expire after 5400 seconds, not signed URLs, which means any integration syncing Procore files to NetSuite, SharePoint, or Docusign needs a token-refresh strategy built in from day one. Webhooks need idempotent handling since Procore delivers events, not guarantees, and file sync needs to use Procore's direct upload flow rather than inline payloads. This guide covers all three, with the integration pitfalls that only show up once you are running in production.

How does the Procore API handle authentication?

Procore's API runs entirely on OAuth 2.0, and it supports two grant types depending on who or what is making the request.

Authorization Code grant is for apps acting on behalf of a specific Procore user. The user logs into Procore, approves your app, and Procore redirects back with a single-use authorization code. That code expires in 10 minutes, so your callback handler has to exchange it immediately:

Client Credentials grant is for unattended integrations, nightly sync jobs, report generators, or anything that runs without a human in the loop. Procore implements this through a Developer Managed Service Account (DMSA), which carries company- and project-level permissions. There is no authorization code step; you exchange your client ID and secret directly for a token:

Either way, the access token you get back is valid for 5400 seconds, 1.5 hours. That is the single most common cause of production Procore integrations silently failing: someone caches a token for a long-running batch job, the job runs past 90 minutes, and every call after that point starts returning 401s with no obvious warning in the logs until someone notices the sync stopped updating.

Authorization Code or Client Credentials: which should your integration use?

Use Authorization Code when the integration is acting as a specific Procore user, for example a project manager approving submittals through a custom dashboard that should only see what that user can see in Procore. Use Client Credentials and a DMSA when the integration is a backend process, for example a nightly job that pulls new RFIs into NetSuite or pushes executed documents into Docusign Workflow Builder on a schedule. Most server-to-server integrations between Procore and an ERP or agreement platform belong in the second category, because they need consistent company-wide permissions rather than a single user's session.

Whichever grant you pick, store the refresh logic as a first-class part of the integration, not an afterthought. A background scheduler that refreshes the token at the 70-minute mark, before the 90-minute expiry, removes an entire category of intermittent failures.

How do Procore webhooks actually work?

Procore's Webhooks API lets you programmatically create and manage webhook subscriptions to resource events, rather than relying only on static configuration screens. You register a hook against specific resource types and events, Procore posts a payload to your endpoint when a matching event fires, and your endpoint is responsible for acknowledging and processing it.

The two mistakes that break Procore webhook integrations in production are the same two that break every webhook integration:

1. Treating delivery as guaranteed and ordered. It is not. Your endpoint needs to handle events arriving out of order or more than once, which means every handler should be idempotent, typically by checking the resource's updated-at timestamp or an event ID before applying a change.
2. Doing synchronous work inside the webhook handler. If your handler calls Procore back for more data, writes to NetSuite, and pushes a document into Docusign Workflow Builder, all inline, a slow downstream system turns into a dropped Procore event. Acknowledge the webhook fast, queue the actual work, and process it asynchronously with its own retries.

This is exactly the pattern Baton exists to solve for the Docusign side of the chain: it sits between the source platform and Docusign Workflow Builder, verifies webhook signatures, retries failed deliveries, and gives you central logging so a dropped event doesn't disappear silently. If your Procore integration's end state is triggering a Docusign Workflow Builder run, for instance starting a signature flow once a submittal is approved, the same reliability discipline fluidlabs covers in how to trigger Workflow Builder runs from any platform applies directly to the Procore-to-Docusign leg.

How should file sync work between Procore and downstream systems?

For new integrations, Procore recommends a direct upload flow through its Uploads API instead of embedding file content in a standard JSON request. You create an upload, get back instructions for posting the file to Procore's storage service, complete the upload, then attach it to the resource (an RFI, submittal, or drawing) using the returned reference.

Reading files back out works through the Documents tool's Company Folders and Files and Project Folders and Files endpoints. If your integration mirrors an entire project's document tree into NetSuite or a document management system, do it incrementally; Procore's own documentation flags that recursive folder traversal needs explicit rate-limit awareness, because a naive recursive crawl of a large project's folder structure can burn through your hourly call budget before it finishes one pass.

The practical pattern for keeping a downstream system in sync without re-crawling everything is to use the webhook stream to tell you what changed, then fetch only that resource's current file state, rather than polling the whole folder tree on a schedule.

Why pre-authenticated file URLs are becoming the wrong default

Microsoft announced on October 8 that it is retiring pre-authenticated, or tempauth, URLs for SharePoint Online and OneDrive file access. Apps that currently grab a short-lived signed URL and hand it to a download step will have to authenticate every request with a Microsoft Entra ID access token instead, by April 1, 2027.``` That change is not really about SharePoint. It is Microsoft confirming what construction-system integrations should already be designing for: file access that depends on a short-lived signed link is a workaround, not an authentication strategy, and it breaks the moment the destination system tightens its security model. A Procore integration that pushes attachments into SharePoint, NetSuite, or a Docusign envelope should authenticate every file request with a proper access token and a refresh path, the same discipline Procore itself already requires for its own API, rather than leaning on a signed URL that happens to work today.

If your integration touches NetSuite on the way from Procore to Docusign Workflow Builder, the token-refresh requirement applies at every hop, not just the Procore leg: Procore's 90-minute token, NetSuite's own OAuth tokens, and Docusign's access tokens all need independent refresh handling, because they do not expire at the same time or in the same way.

What should you design around for Procore API rate limits?

Procore's API enforces two separate rate limits: an hourly limit on a rolling 60-minute window, and a spike limit on a 10-second window. Every request counts against the limit, including requests that fail, so a retry loop with no backoff can burn your hourly budget faster than the original sync job would have. Procore returns rate limit headers on every response; read them and back off proactively rather than waiting for a 429.

For a sync job touching thousands of RFIs, submittals, or documents, batch your reads, cache what does not change often (project metadata, user lists), and let webhooks drive incremental updates instead of re-pulling full datasets on a timer.

FAQ

How long do Procore API access tokens last? Procore access tokens are valid for 5400 seconds, or 1.5 hours, after which they must be refreshed using the refresh token or, for Client Credentials grants, reissued.

Should a Procore-to-ERP integration use Authorization Code or Client Credentials? Unattended, scheduled, or backend integrations, like a nightly sync into NetSuite, should use Client Credentials with a Developer Managed Service Account, since there is no specific user session to maintain. Authorization Code is for apps acting on behalf of one logged-in user.

Does Procore guarantee webhook delivery order? No. Treat every Procore webhook handler as something that may receive events out of order or more than once, and make the handler idempotent by checking a timestamp or event identifier before applying changes.

What is the right way to upload files to Procore through the API? Use the Uploads API's direct upload flow: create an upload, post the file to the returned storage instructions, complete the upload, then attach the resulting reference to the target resource.

Why does the Microsoft Graph tempauth URL retirement matter for a Procore integration? It signals the same shift Procore, Docusign, and most modern platform APIs have already made: authenticate file access with scoped tokens, not short-lived signed URLs, because the signed-URL shortcut is what Microsoft is now formally retiring for its own file APIs.

Next step

If you are connecting Procore to NetSuite, SharePoint, or Docusign Workflow Builder and want the auth, webhook, and file-sync layer built right the first time, fluidlabs has delivered production Procore integrations and can talk through your specific integration before you write the first line of code. For more on the Docusign side of the chain, browse the Docusign IAM resources library.