PayPal Button that adds multiple items simultaneously

I am trying to have a single paypal button add multiple items to PayPal cart at same time rather than people needing to add each product one at a time. I am trying the following code which I found at

<form target="_blank" action="" method="post">
    <input type="hidden" name="cmd" value="_cart">
    <input type="hidden" name="upload" value="1">
    <input type="hidden" name="business" value="">
    <input type="hidden" name="currency_code" value="US">

    <input type="hidden" name="item_first_1" value="beach ball">
    <input type="hidden" name="amount_1" value="10">
    <input type="hidden" name="quantity_1" value="1">

    <input type="hidden" name="item_second_2" value="towel">
    <input type="hidden" name="amount_2" value="20">
    <input type="hidden" name="quantity_2" value="1">

    <input type="hidden" name="cancel_return" value="">
    <input type="hidden" name="return" value="">

    <input type="submit" value="PayPal">

Ultimately I would like to generate these hidden user inputs based on user input, but I can’t even get the button to add products to the PayPal cart. When I click submit from the code above, the PayPal page says, Error detected" and the shopping cart remains empty. Any thoughts on what I’m doing wrong? Thanks!

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