I'm facing an issue with paypal express checkout.
I just set it up on a website, and it works fine most of the time. Some times though, I'm having an error 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.
The weird thing is that this error is apparently raised when this logic is not respected:
ITEMAMT + SHIPPINGAMT - SHIPDISCANT+ TAXAMT = AMT
Sum of all L_PAYMENTREQUEST_0_AMT* = ITEMAMT
And in my case this logic is respected (here is a sample of data sent that raised an error).
:PAYMENTREQUEST_0_INVNUM => "480905"
:PAYMENTREQUEST_0_AMT => "11.96"
:PAYMENTREQUEST_0_TAXAMT => "0"
:PAYMENTREQUEST_0_SHIPPINGAMT => "0"
:PAYMENTREQUEST_0_SHIPDISCAMT => "0"
:PAYMENTREQUEST_0_CURRENCYCODE => USD
:PAYMENTREQUEST_0_ITEMAMT => "11.96"
:PAYMENTREQUEST_0_CUSTOM => User#551588
:L_PAYMENTREQUEST_0_PAYMENTACTION => Sale
:L_PAYMENTREQUEST_0_NAME0 => Xhilaration Top, Sleeveless XXL
:L_PAYMENTREQUEST_0_AMT0 => "3.99"
:L_PAYMENTREQUEST_0_QTY0 => "1"
:L_PAYMENTREQUEST_0_ITEMCATEGORY0 => Digital
:L_PAYMENTREQUEST_0_NAME1 => Hillard & Hanson Top, Short-sleeve XL
:L_PAYMENTREQUEST_0_AMT1 => "3.99"
:L_PAYMENTREQUEST_0_QTY1 => "1"
:L_PAYMENTREQUEST_0_ITEMCATEGORY1 => Digital
:L_PAYMENTREQUEST_0_NAME2 => Shipping and Handling (USPS)
:L_PAYMENTREQUEST_0_AMT2 => "3.98"
:L_PAYMENTREQUEST_0_QTY2 => "1"
:L_PAYMENTREQUEST_0_ITEMCATEGORY2 => Digital
SHIPPINGAMT and SHIPDISCANT and TAXAMT are = 0 all the time because we put shipping and promo as items with negative amounts.
So we just basically need Sum of all L_PAYMENTREQUEST_0_AMT* = ITEMAMT = AMT, which is the case.
Something else that is interesting is that this seem to happen randomly (like sometimes it's not working for some data, and the same data will work an hour after).
I have no idea where this can come from, so any ideas are welcome.
PayPal Express Checkout gives me error 10413 apparently randomly
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