Paying for Multiple Items (At Once) via Paypal

Paying for multiple items (at once) via paypal

See this sample and make the changes to yours accordingly. Basically add underscore to item name before number and give unique name to amount also with underscore and number.

You have to give amount to each item based on your carts totals.

<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_cart">
<input type="hidden" name="upload" value="1">
<input type="hidden" name="business" value="youremail@mail.com">
<input type="hidden" name="currency_code" value="USD">

<input type="hidden" name="item_name_1" value="beach ball">
<input type="hidden" name="amount_1" value="15">

<input type="hidden" name="item_name_2" value="towel">
<input type="hidden" name="amount_2" value="20">

<input type="image" src="http://www.paypal.com/en_US/i/btn/x-click-but01.gif" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
</form>

Specify Quantity(optional)

<input type="hidden" name="quantity_1" value="1">

for more reference about cart: Paypal Cart

Pay Multiple items at once using PayPal REST API ASP.NET MVC

My guess, which is without seeing the full response is that your total does not add up with the details/item list. The validation adds up all the item values, which has to equal subtotal, the subtotal + tax etc (details) has to equal total.

sum (item.price * item.count) == sub total

sum of details == total

submitting multiple items to paypal cart at once with php

Here is the solution

<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_cart">
<input type="hidden" name="upload" value="1">
<input type="hidden" name="business" value="email@email.com">
<input type="hidden" name="item_name_1" value="Item #1">
<input type="hidden" name="amount_1" value="1.00">
<input type="hidden" name="item_name_2" value="Item #2">
<input type="hidden" name="amount_2" value="2.00">
<input type="submit" value="PayPal">
</form> 

How to show multiple items on Paypal

Cart upload (_cart) is a very old (20 years?), deprecated integration method that doesn't give a good checkout experience.

The best solution is to use a smart button; see the current guide at Set up standard payments, particularly the section on extending the order creation with more detail:

createOrder: function(data, actions) {
      return actions.order.create({
         "purchase_units": [{
            "amount": {
              "currency_code": "USD",
              "value": "100",
              "breakdown": {
                "item_total": {  /* Required when including the `items` array */
                  "currency_code": "USD",
                  "value": "100"
                }
              }
            },
            "items": [
              {
                "name": "First Product Name", /* Shows within upper-right dropdown during payment approval */
                "description": "Optional descriptive text..", /* Item details will also be in the completed paypal.com transaction view */
                "unit_amount": {
                  "currency_code": "USD",
                  "value": "50"
                },
                "quantity": "2"
              },
            ]
          }]
      });
    },

Since you are using a PHP backend, for best results you should do this order creation and capture from your server via API instead of in the JS. There are notes in that guide for how to do a server integration and connect it to the JS with fetch(, see the demo linked there.

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