What it is
The ERP Integration & API Inventory is a consultant-grade spreadsheet for mapping every system that connects to your ERP — the interface method, direction, frequency, data objects exchanged, owner, and business criticality. An ERP rarely runs alone; it exchanges data with CRM, e-commerce, the warehouse, payroll, banking, tax, and BI, and this workbook becomes the single source of truth for how each of those interfaces connects, which way the data flows, how often, what it carries, who owns it, and how badly it would hurt if it broke.
Each interface is one row in the Integration Register, capturing System, Direction (from the ERP's perspective), Method (iPaaS, API, file/batch, manual), Frequency, Data objects, Owner, Criticality from 1 to 5, and Status. A computed Risk weight column multiplies criticality by a penalty for fragile methods, so file/batch and manual critical interfaces automatically rise to the top of the risk picture rather than hiding among healthier API connections.
From the register, a Risk Review tab tallies your exposure and a Dashboard rolls it into a one-page integration health view — interface counts by method and direction, a weighted criticality profile, and a risk-exposure view for unowned or batch-only critical interfaces. It is the document you take into an ERP selection, an audit, or a migration so you understand your integration surface area and where the fragility sits before it surprises you.
What it's used for
Teams use the inventory to make their integration landscape visible and to quantify where the risk concentrates. Before a selection or migration, it turns a vague sense of 'lots of systems talk to the ERP' into a precise, owned, risk-ranked catalogue.
- ✓ Cataloguing every interface to and from the ERP — CRM, e-commerce, WMS, payroll, banking, tax, BI — in one register, so the full integration surface area is visible rather than scattered in people's heads.
- ✓ Recording the method, direction, frequency, and data objects for each interface, so you know exactly how each connection works and what it carries.
- ✓ Assigning an owner to every interface, surfacing the unowned ones that are a hidden risk because no one is accountable when they break.
- ✓ Scoring business criticality 1 to 5 and letting the workbook compute a Risk weight that penalizes fragile methods, so file/batch and manual critical interfaces rise to the top of attention.
- ✓ Quantifying exposure on the Risk Review tab — counts of critical, unowned, and batch-only interfaces — to feed a risk-ratio view of the landscape.
- ✓ Producing a one-page integration health dashboard with interface counts by method and direction and a weighted criticality profile, suitable for a selection committee, an audit, or a migration plan.
- ✓ Informing ERP selection and migration by exposing which integrations must be rebuilt, which are fragile, and where the migration's biggest integration risks lie before the project starts.
Who uses it
The inventory is built and maintained by the technical and integration teams but read by anyone making decisions about the ERP landscape. It is equally useful to an architect, an auditor, and a project sponsor.
Context & good to know
Modern ERPs are hubs, not islands — a NetSuite or Dynamics environment typically exchanges data with Salesforce, Shopify, a warehouse system, payroll, banking, tax engines, and BI tools. That web of interfaces is where much of the operational risk lives, yet it is usually undocumented, scattered across the knowledge of individuals, and only fully understood when something breaks. The inventory exists to make that surface area explicit and owned, so the integration landscape is a managed asset rather than a source of nasty surprises.
Not all interfaces carry equal risk, and the workbook's risk weighting captures that nuance. A high-criticality finance interface running on a fragile file/batch or manual method is far more dangerous than the same criticality on a resilient API or iPaaS connection. By multiplying criticality by a penalty for fragile methods, the Risk weight column automatically surfaces the interfaces that should worry you most — the batch-only critical feeds and the unowned connections — instead of letting them blend in with healthier integrations.
The inventory earns its keep most at two moments: ERP selection and migration. When you are choosing a new platform, the integration surface area tells you how much rebuild work a switch implies and where the integration risk concentrates. When you are migrating, the register tells you which interfaces must be re-pointed, which are fragile and need hardening first, and which lack an owner to manage the cutover. Carrying the one-page dashboard into those decisions — alongside the go-live readiness checklist's integration sign-off — means the integration risk is quantified and visible before, not during, the project.
The inventory also ages well as a living operational document. Long after the ERP project ends, the register remains the authoritative map of which systems depend on the ERP and how — invaluable when you add a new application, retire an old one, or investigate why a downstream report went stale. Keeping criticality and ownership current means that the next time someone proposes connecting a system to your NetSuite or Dynamics environment, the risk-weighted view immediately shows where the new interface fits and whether it concentrates more fragility on an already critical data flow.