<!-- Extension API v0 — pre-1.0. Interfaces may change without notice until P2 seals the custom-code format. First-party extensions track HEAD. -->

# `catalog.stock.adjust`

Adjust stock by a ± delta (receiving, stocktake, connector sync). Fails on untracked items; expectedStock = compare-and-set.

- **scope**: `catalog:write`
- **storefront-visible** (bumps the catalog generation): no
- **destructive**: no

## Payload

| field | type | required | notes |
|---|---|---|---|
| `id` | string (/^prd_[a-zA-Z0-9]{1,32}$/) \| string (/^var_[a-zA-Z0-9]{1,32}$/) | yes |  |
| `delta` | integer (-1000000..1000000) | yes |  |
| `reason` | "adjust" \| "correction" \| "return" \| "import" \| "sync" | no |  |
| `channel` | string (/^[a-z0-9_]{2,24}$/, default "storefront") | no |  |
| `refType` | string (≤32 chars) | no |  |
| `refId` | string (≤64 chars) | no |  |
| `note` | string (≤200 chars) | no |  |
| `expectedStock` | integer (0..9007199254740991) | no |  |
| `allowNegative` | boolean (default false) | no |  |

### JSON Schema

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "id": {
      "anyOf": [
        {
          "type": "string",
          "pattern": "^prd_[a-zA-Z0-9]{1,32}$"
        },
        {
          "type": "string",
          "pattern": "^var_[a-zA-Z0-9]{1,32}$"
        }
      ]
    },
    "delta": {
      "type": "integer",
      "minimum": -1000000,
      "maximum": 1000000
    },
    "reason": {
      "default": "adjust",
      "type": "string",
      "enum": [
        "adjust",
        "correction",
        "return",
        "import",
        "sync"
      ]
    },
    "channel": {
      "default": "storefront",
      "type": "string",
      "pattern": "^[a-z0-9_]{2,24}$"
    },
    "refType": {
      "type": "string",
      "maxLength": 32
    },
    "refId": {
      "type": "string",
      "maxLength": 64
    },
    "note": {
      "type": "string",
      "minLength": 1,
      "maxLength": 200
    },
    "expectedStock": {
      "type": "integer",
      "minimum": 0,
      "maximum": 9007199254740991
    },
    "allowNegative": {
      "default": false,
      "type": "boolean"
    }
  },
  "required": [
    "id",
    "delta"
  ],
  "additionalProperties": false
}
```