Você faz o deploy.
A DevPay cobra.

curl -X POST https://api.devpay.com.br/api/v1/payments/pix \
  -H "Authorization: Bearer $DEVPAY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "amount": 197.00,
    "customer": {
      "name": "Ana Souza",
      "email": "ana@dev.io",
      "cpf": "123.456.789-09"
    }
  }'

# ← 201 Created: QR Code e copia-e-cola do PIX

const res = await fetch('https://api.devpay.com.br/api/v1/payments/pix', {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.DEVPAY_API_KEY}`,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    amount: 197.0,
    customer: { name: 'Ana Souza', email: 'ana@dev.io' },
  }),
});

const pix = await res.json();
console.log(pix); // QR Code + copia-e-cola

$response = Http::withToken(env('DEVPAY_API_KEY'))
    ->post('https://api.devpay.com.br/api/v1/payments/pix', [
        'amount'   => 197.00,
        'customer' => [
            'name'  => 'Ana Souza',
            'email' => 'ana@dev.io',
        ],
    ]);

$pix = $response->json(); // QR Code + copia-e-cola

// POST no endpoint cadastrado no painel
{
  "event": "order.paid",
  "data": {
    "order_id": 4821,
    "status": "paid",
    "amount": 197.00,
    "payment_method": "pix",
    "customer": { "email": "ana@dev.io" }
  }
}

// responda 2xx — falhas ficam no log para reenvio