[PAYMENTREQUEST_PAYMENTACTION] => Sale
[PAYMENTREQUEST_ITEMAMT] => 12
[PAYMENTREQUEST_AMT] => 14.21
Должно быть:
[PAYMENTREQUEST_0_PAYMENTACTION] => Sale
[PAYMENTREQUEST_0_ITEMAMT] => 12
[PAYMENTREQUEST_0_AMT] => 14.21
Кроме того, ваши суммы не складываются. Вы устанавливаете максимум 14,21, но все вместе составляет всего 7,41
L_AMTm (на самом деле должно быть L_PAYMENTREQUEST_0_AMTm) зависит от конкретного предмета.
PAYMENTREQUEST_0_ITEMAMT - это промежуточный итог всех пунктов
PAYMENTREQUEST_0_AMT должно быть суммой всего сложенного вместе.
1009 * Е.Г. *
[SOLUTIONTYPE] => Sole
[LANDINGPAGE] => Billing
[L_PAYMENTREQUEST_0_ITEMCATEGORY0] => Physical
[L_PAYMENTREQUEST_0_QTY0] => 4
[L_PAYMENTREQUEST_0_AMT0] => 2.20
[L_PAYMENTREQUEST_0_DESC0] => ZajÄ…czek 1
[L_PAYMENTREQUEST_0_NAME0] => ZajÄ…czek 1
[L_PAYMENTREQUEST_0_CURRENCYCODE0] => GBP
[L_PAYMENTREQUEST_0_ITEMCATEGORY1] => Physical
[L_PAYMENTREQUEST_0_QTY1] => 1
[L_PAYMENTREQUEST_0_AMT1] => 3.20
[L_PAYMENTREQUEST_0_DESC1] => ZajÄ…czek 2
[L_PAYMENTREQUEST_0_NAME1] => ZajÄ…czek 2
[L_PAYMENTREQUEST_0_CURRENCYCODE1] => GBP
[PAYMENTREQUEST_0_PAYMENTACTION] => Sale
[PAYMENTREQUEST_0_SHIPPINGAMT] => 2.21
[PAYMENTREQUEST_0_ITEMAMT] => 5.40
[PAYMENTREQUEST_0_AMT] => 7.61
Или официальный пример PayPal :
&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