# Prelude - Workflow node | Docs - nodulz

Source: https://nodulz.com/docs/nodes/prelude

Language: en

Send a message with Prelude or create and check an OTP verification.

## Usage and specifics

Select a Prelude credential and operation, then enter the recipient. For messages, supply templateId and variables; for verification, supply the code required by the operation. Check account costs and limits.

Technical type : `prelude`. Runtime : `nodulz`.

## Credentials and prerequisites

- [Prelude](/docs/credentials) (`integration` / `prelude`). Prelude API token for messaging and OTP verification.

Create credentials in your nodulz instance’s Credentials area, then select them on the node. Availability depends on ownership and sharing. See the [credentials guide](/docs/credentials) for access and rotation.

## Parameters

Names below are technical keys. Defaults are not a ready-to-run configuration: complete fields required by your operation. Paths containing [] describe list items; some fields depend on the selected mode.

| Parameter | Type | Default | Values / limits |
| --- | --- | --- | --- |
| `operation` | `enum` | `"send_message"` | `send_message`, `create_verification`, `check_verification` |
| `credentialId` | `string` | `""` | - |
| `to` | `string` | `""` | - |
| `templateId` | `string` | `""` | - |
| `variables` | `string` | `"{}"` | - |
| `code` | `string` | `""` | - |

## Configuration help

| Setting | Purpose and guidance |
| --- | --- |
| `operation`<br>Action | Send a Notify message with an approved template, create or retry an OTP verification, or check the received code. |
| `credentialId`<br>Prelude credential | Select the Prelude API token stored in credentials. Its value stays protected. |
| `variables`<br>Template variables (JSON) | JSON object containing exactly the template variables, with string values. Workflow expressions are supported. Use an empty object for a template without variables. |

## Initial configuration

Initial catalog configuration example, to adapt before running. Keep secrets in credentials.

```json
{
  "operation": "send_message",
  "credentialId": "",
  "to": "",
  "templateId": "",
  "variables": "{}",
  "code": ""
}
```

## Verification

Test with representative data. Check node output in the inspector and logs, then use editor mapping for downstream fields. A trigger test with a simulated payload does not validate external service delivery.

See also : [Expressions and data](/docs/expressions), [Executions](/docs/executions), [Node catalog](/docs/nodes).

## Explore further

- [Features - nodulz](https://nodulz.com/product/overview)
- [Node catalog - nodulz](https://nodulz.com/product/catalog)
- [MCP server - nodulz](https://nodulz.com/product/mcp)
- [Pricing - nodulz](https://nodulz.com/pricing)
- [Use cases and workflow automation - nodulz](https://nodulz.com/use-cases)
- [Choose what your workflows can do. - nodulz](https://nodulz.com/compare)
- [Documentation - nodulz](https://nodulz.com/docs)