Vercel AI SDK

npm install ai payman-paykit @ai-sdk/openai

import { openai } from '@ai-sdk/openai';
import { streamText } from 'ai';
import { paykit } from 'payman-paykit';

// Allow streaming responses up to 30 seconds
export const maxDuration = 30;

const tools = paykit({
  apiSecret: process.env.PAYMAN_API_SECRET!,
  environment: process.env.PAYMAN_ENVIRONMENT as 'sandbox' | 'production'
});

export async function POST(req: Request) {
  try {
    const { messages } = await req.json();
    
    const model = openai('gpt-4');

    try {
      const result = streamText({
        model,
        toolCallStreaming: true,
        system: 'You are a payment assistant that can help send money and manage financial transactions.',
        messages,
        tools,
      });

      return result.toDataStreamResponse();
    } catch (streamError) {
      throw new Error(`Stream error: ${streamError.message}`);
    }
  } catch (error) {
    return new Response(JSON.stringify({ error: error.message }), {
      status: 500,
      headers: { 'Content-Type': 'application/json' }
    });
  }
}

OPENAI_API_KEY=sk-...
PAYMAN_API_SECRET=your_api_secret
PAYMAN_ENVIRONMENT=sandbox

'use client';

import { useChat } from 'ai/react';

export default function Chat() {
  const { messages, input, handleInputChange, handleSubmit } = useChat();

  return (
    <div>
      {messages.map(m => (
        <div key={m.id}>
          {m.role}: {m.content}
        </div>
      ))}

      <form onSubmit={handleSubmit}>
        <input
          value={input}
          onChange={handleInputChange}
          placeholder="Send a message..."
        />
        <button type="submit">Send</button>
      </form>
    </div>
  );
}

// User: "Send $50 to John"
// AI will use paykit.sendPayment()

// User: "Create a deposit link for $100"
// AI will use paykit.initiateCustomerDeposit()