ERP API Integration Explained: REST, Webhooks, Auth and Idempotency
A plain-English explanation of ERP API integration: REST APIs, webhooks, authentication methods, idempotency, pagination, rate limits and error handling.
Integration · Productivity
Overview
We integrate the ERP with Microsoft 365 through Microsoft Graph and Entra ID.
01Data
| Entity | Direction | Notes |
|---|---|---|
| User identity (SSO) | App → ERP | Users sign in with Entra ID credentials. |
| Emails | App → ERP | Relevant emails logged against customers, orders or tickets. |
| Calendar events | ⇄ Both | Meetings and activities synchronised. |
| Notifications | ERP → App | Approvals and alerts posted to Teams channels. |
| Documents | ⇄ Both | Files stored in SharePoint, linked to ERP records. |
02Use cases
One identity, centrally managed access.
Purchase or discount approvals actioned from Teams.
Contracts and drawings in SharePoint, linked to ERP.
03 — Architecture
An Entra ID app registration provides OAuth for Graph API access. SSO uses OpenID Connect. Graph change notifications (webhooks) inform the ERP of calendar or file changes.
Teams notifications are posted through Graph or incoming webhooks with adaptive cards for approvals.
04Reliability
Entra ID app registration with delegated or application permissions scoped to what's needed; admin consent recorded. Secrets or certificates rotated.
Expired subscriptions, permission errors and throttling are detected and logged; subscriptions renewed automatically.
Throttled requests retried using Graph's retry-after guidance.
05 — Data mapping
| Microsoft 365 | ERP |
|---|---|
| Entra user (UPN) | ERP user login |
| Outlook message | Chatter / message on record |
| Calendar event | Activity |
| SharePoint item | Attachment link |
| Teams channel | Notification target |
06 — Automation
07 — Security
Least-privilege Graph permissions, conditional access policies through Entra ID, and audit logs of access.
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Insights
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FAQ
Yes, via single sign-on with Entra ID.
Yes, with notifications that link or act on ERP approvals.
Yes, linked to ERP records rather than duplicated.
Next step
Describe the data that needs to move and who owns it. We will propose a design with error handling and monitoring included.