我正在使用PayPal快速结账 API，但在设置数量时遇到问题。以下是我的 URI 参数：
$params = array(
'METHOD' => 'SetExpressCheckout',
'PAYMENTREQUEST_0_SHIPPINGAMT' => '0',
'PAYMENTREQUEST_0_TAXAMT' => '0',
'PAYMENTREQUEST_0_HANDLINGAMT' => '0',
'PAYMENTREQUEST_0_AMT' => "50.00",
'RETURNURL' => $this->_returnUri,
'CANCELURL' => $this->_cancelUri,
'HDRIMG' => $this->_logoUri,
'PAYMENTREQUEST_0_CURRENCYCODE' => 'GBP',
'L_PAYMENTREQUEST_0_DESC0' => 'Product description',
'L_PAYMENTREQUEST_0_NAME0' => 'Product name',
'L_PAYMENTREQUEST_0_AMT0' => "50.00",
'L_PAYMENTREQUEST_0_QTY0' => "2"
);
如果L_PAYMENTREQUEST_0_QTY0设置为 1，则过程正常。但是，将其更改为 2 并将"PAYMENTREQUEST_0_ITEMAMT"=>"100.00"添加到数组中会给我以下错误：
TIMESTAMP: 2012-04-17T12:11:16Z
CORRELATIONID: da43f6c91254
ACK: Failure
VERSION: 88.0
BUILD: 2808426
L_ERRORCODE0: 10413
L_SHORTMESSAGE0: Transaction refused because of an invalid argument. See additional error messages for details.
L_LONGMESSAGE0: The totals of the cart item amounts do not match order amounts.
L_SEVERITYCODE0: Error
我已经连续尝试了几个小时来修复它并放弃了。有人可以突出显示我需要做的需要让它工作吗？
你缺少一个ITEMAMT .另请参阅我在PayPal Express结帐中的答案，其中包含运输成本和错误，其中包含多个数量的工作示例。
&L_PAYMENTREQUEST_0_NAME0=10% Decaf Kona Blend Coffee
&L_PAYMENTREQUEST_0_NUMBER0=623083
&L_PAYMENTREQUEST_0_DESC0=Size: 8.8-oz
&L_PAYMENTREQUEST_0_AMT0=9.95
&L_PAYMENTREQUEST_0_QTY0=2
&L_PAYMENTREQUEST_0_NAME1=Coffee Filter bags
&L_PAYMENTREQUEST_0_NUMBER1=623084
&L_PAYMENTREQUEST_0_DESC1=Size: Two 24-piece boxes
&L_PAYMENTREQUEST_0_AMT1=39.70
&L_PAYMENTREQUEST_0_QTY1=2
&PAYMENTREQUEST_0_ITEMAMT=99.30
&PAYMENTREQUEST_0_TAXAMT=2.58
&PAYMENTREQUEST_0_SHIPPINGAMT=3.00
&PAYMENTREQUEST_0_HANDLINGAMT=2.99
&PAYMENTREQUEST_0_SHIPDISCAMT=-3.00
&PAYMENTREQUEST_0_INSURANCEAMT=1.00
&PAYMENTREQUEST_0_AMT=105.87
&PAYMENTREQUEST_0_CURRENCYCODE=USD
与问题没有直接关系，但由于在通过错误消息搜索时，这首先出现在Google中，因此可能对收到此错误的其他人有用。
如果未设置某些字段（空/空），则可能会收到此错误。
例如，在我的情况下，它是（为清楚起见添加了换行符）：
PAYMENTREQUEST_0_PAYMENTACTION=Sale
&REQCONFIRMSHIPPING=0
&RETURNURL=some_url
&CANCELURL=some_other_url
&BRANDNAME=Brand
&L_PAYMENTREQUEST_0_NAME0=
&L_PAYMENTREQUEST_0_AMT0=1.00
&L_PAYMENTREQUEST_0_QTY0=1
&PAYMENTREQUEST_0_AMT=1.00
&PAYMENTREQUEST_0_CURRENCYCODE=USD
它给了我同样的错误，即使金额很好。我认为这是一个解析问题，因为如果您在 L_PAYMENTREQUEST_0_NAME0= 之后插入一个空格
&L_PAYMENTREQUEST_0_NAME0=&L_PAYMENTREQUEST_0_AMT0=1.00
它工作正常。
所以我的猜测是，在PayPal结束时，它只是将"&L_PAYMENTREQUEST_0_AMT0=1.00"分配给L_PAYMENTREQUEST_0_NAME0，从而有效地将其从消息中删除，从而触发此错误，因为没有该行，金额实际上不会加起来。
我遇到了同样的麻烦，并通过按参数 L_PAYMENTREQUEST_0_AMT$k 的函数number_format格式化 foreach 中的价格来解决它
例：
$items_amount = 0;
foreach ($products as $k => $product) {
$params["L_PAYMENTREQUEST_0_NAME$k"] = $product['name'];
$params["L_PAYMENTREQUEST_0_DESC$k"] = $product['desc'];
$params["L_PAYMENTREQUEST_0_AMT$k"] = number_format($product['priceIVA'], 2);
$params["L_PAYMENTREQUEST_0_QTY$k"] = $product['count'];
$items_amount += (floatval($product['priceIVA']) * $product['count']);
}
$params['PAYMENTREQUEST_0_AMT'] = $params['PAYMENTREQUEST_0_ITEMAMT'] = number_format($items_amount, 2);