chromium/components/test/data/payments/payment_request_multiple_requests.html

<!DOCTYPE html>
<script>
all_requests = [];
for (var i = 0; i < 5; i++) {
  all_requests.push(new PaymentRequest(
    [{supportedMethods: 'basic-card', data: {supportedNetworks: ['visa']}}],
    {total: {label: 'Total!', amount: {currency: 'USD', value: '1.00'}}}));
}
</script>