# Refund approval

The billing system asks for a refund. Momor reads the request, pays small refunds straight away, and asks the finance lead before paying anything over $500.

- **Trigger:** Billing system API key
- **Steps:** 8, three at the top level
- **Waits for:** The finance lead, until they answer
- **Uses:** Billing tool server

Trigger: Billing system → Model: Read the request → Logic: Over $500? → Wait: Ask finance → Tool: Issue the refund → Output: Respond

[Open in Designer](/workflows/designer)

## How it works

- **Read.** Ask the model turns the billing system’s message into an amount, a customer and the invoice it refunds.
- **Check.** If the amount is over $500, the run stops and asks whether to approve. Smaller refunds skip the question.
- **Decide.** A decline ends with a reply giving the reason. Anything else goes on to payment.
- **Pay.** Call a tool issues the refund through the billing tool server.
- **Reply.** The last model step tells the billing system the refund was issued and gives its refund id. That reply is the run’s result.

## Starting it and answering

The billing system starts a run with its API key and the customer’s message as the `Prompt`. When a refund is over $500, it receives `wait.intervention.raised` on the run’s stream, shows the question to the finance lead, and posts their answer to [`POST /workflow/runs/{runId}/waits/{waitId}`](/docs/workflows/api/answer-a-question/). The run keeps its place for as long as that takes.

## The workflow

```yaml title="RefundApproval.yaml"
Workflow: RefundApproval
Description: Reads a refund request, asks before paying anything over $500, and issues the refund.
Triggers:
  - New: Refund
    Schema:
      type: object
      required: [Prompt]
      properties:
        Prompt: { type: string }
Operations:
  - Tool: IssueRefund
    Locator: mcp://4b1e9a52-0f3c-4d2a-9e61-2a7f5c3d8b10/issue_refund
  - Wait: Clarification
    Locator: embedded://momor.ai/services/tools/clarification
Output: Content
Steps:
  - ModelCall: Read
    Instructions: Read the refund request. Return the amount, the customer and the invoice it refunds.
    Output:
      Structured:
        type: object
        required: [Amount, Customer, Invoice]
        properties:
          Amount: { type: number }
          Customer: { type: string }
          Invoice: { type: string }
  - Branch: Check
    Cases:
      - When: { GreaterThan: { Field: Read.Amount, Value: 500 } }
        Then:
          - Wait: Approve
            Operation: Clarification
            Question: This refund is over $500. Approve it?
  - Branch: Decision
    Cases:
      - When: { Exists: { Field: Check.Declined } }
        Then:
          - ModelCall: Declined
            Instructions: Tell the billing system the refund was declined, and give the reason.
            Output: Content
    Else:
      - ExecuteTool: Pay
        Operations: [IssueRefund]
        Input:
          invoice: { Field: Read.Invoice }
          amount: { Field: Read.Amount }
      - DeliverResults: HandOver
      - ModelCall: Reply
        Instructions: Tell the billing system the refund was issued, and give its refund id.
        Output: Content
```

> **Before you upload it**
> Replace the `mcp://` locator with your billing tool server’s connection id and tool name. An upload whose locator matches no registered tool is refused.