## List Existing Custom Scan Expressions

`client.ContentScanning.Payloads.List(ctx, query) (*SinglePage[PayloadListResponse], error)`

**get** `/zones/{zone_id}/content-upload-scan/payloads`

Get a list of existing custom scan expressions for Content Scanning.

### Parameters

- `query PayloadListParams`

  - `ZoneID param.Field[string]`

    Defines an identifier.

### Returns

- `type PayloadListResponse struct{…}`

  Defines a custom scan expression to match Content Scanning on.

  - `ID string`

    defines the unique ID for this custom scan expression.

  - `Payload string`

    Defines the ruleset expression to use in matching content objects.

### Example

```go
package main

import (
  "context"
  "fmt"

  "github.com/cloudflare/cloudflare-go"
  "github.com/cloudflare/cloudflare-go/content_scanning"
  "github.com/cloudflare/cloudflare-go/option"
)

func main() {
  client := cloudflare.NewClient(
    option.WithAPIToken("Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY"),
  )
  page, err := client.ContentScanning.Payloads.List(context.TODO(), content_scanning.PayloadListParams{
    ZoneID: cloudflare.F("023e105f4ecef8ad9ca31a8372d0c353"),
  })
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", page)
}
```

#### Response

```json
{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "result": [
    {
      "id": "a350a054caa840c9becd89c3b4f0195b",
      "payload": "lookup_json_string(http.request.body.raw, \"file\")"
    }
  ],
  "success": true
}
```