# Register

object type

A Register — a POS terminal / till position at a LogicalFacility: the LOGICAL till identity TillSessions parent to (physical device pairing =, one-way Device→Register — never stored here). The OPERATIONAL lifecycle verbatim. The gate: a LIVE TillSession (open/suspended/counting) blocks deactivate AND doom, CONFLICT/REFERENCED naming it; terminal sessions never block.

## Fields

| Field | Type | Notes |
| --- | --- | --- |
| `id` | [ID](/types/#scalars) `ID!` | The record’s id — a UUID the platform assigned when the record was created; every reference to this record uses it. |
| `sysId` | [String](/types/#scalars) `String!` | The group-scoped human-facing system id (RG-…). |
| `type` | [String](/types/#scalars) `String!` | The kind of record — always `Register` here. |
| `caption` | [String](/types/#scalars) `String!` | The record’s display name — what people see it called. |
| `status` | [String](/types/#scalars) `String!` | The FSM state: active \| inactive \| doomed. |
| `parentId` | [ID](/types/#scalars) `ID!` | The parent LogicalFacility; rootId = the org group; parentId!== rootId always. |
| `rootId` | [ID](/types/#scalars) `ID!` | The org-group family root. |
| `createdAt` | [String](/types/#scalars) `String!` | When the record was created, as a UTC timestamp. |
| `updatedAt` | [String](/types/#scalars) `String!` | When the record last changed, as a UTC timestamp. |
| `revisionNum` | [Int](/types/#scalars) `Int!` | How many times this record has been edited; the first save is 0. |
| `revision` | [ID](/types/#scalars) `ID!` | The OCC revision token — supply it on every mutation of this record; rotates on every write. |
| `refCaptions` | [RefCaption](/types/RefCaption/) `[RefCaption!]!` | The server-composed captions of this record's declared references (the referenced-caption rule) — one row per referenced id; see RefCaption. |
| `code` | [String](/types/#scalars) | Optional mutable merchant reference code; uniqueness NOT enforced. |

## Used by

- [createRegister](/reference/register/createRegister/)
- [deactivateRegister](/reference/register/deactivateRegister/)
- [doomRegister](/reference/register/doomRegister/)
- [reactivateRegister](/reference/register/reactivateRegister/)
- [register](/reference/register/register/)
- [updateRegister](/reference/register/updateRegister/)