# Add to your .env file
M91_SEND_LINK=your_api_key_here

import { generateText, isStepCount, jsonSchema, tool } from 'ai';
import { M91Client } from '@msg91comm/m91';
import { createM91ToolApproval } from '@msg91comm/m91/integrations/vercel-ai';

// The send link comes from a channel in the M91 app. Keep it secret.
const client = new M91Client(process.env.M91_SEND_LINK!);

const issueRefund = tool({
  description: 'Simulate a refund approval; no payment is issued.',
  inputSchema: jsonSchema<{ orderId: string; amount: number }>({
    type: 'object',
    properties: { orderId: { type: 'string' }, amount: { type: 'number' } },
    required: ['orderId', 'amount'],
  }),
  // Replace this simulation with your payment API before issuing real refunds.
  execute: async ({ orderId, amount }) => ({ simulated: true, orderId, amount }),
});

const { text } = await generateText({
  model: 'openai/gpt-5-mini',
  tools: { issueRefund },
  // issueRefund rings a phone first and runs only if a person taps Approve.
  // A rejection, no answer within 10 minutes, or an M91 error denies it.
  toolApproval: createM91ToolApproval(client, {
    tools: ['issueRefund'],
    timeoutSeconds: 600,
  }),
  stopWhen: isStepCount(5),
  prompt: 'Order ORD-40122 never arrived. Refund the customer 48 USD.',
});

console.log(text);