We just recently switched from paypal express and link point to paypal express and paypal pro . If a customer users a coupon (and I think orders less stuff than the coupon is worth) and happens to be in the one state we charge tax in, and tries to pay with paypal or credit card they get a 10413 error. Below is the debug log from me testing it. Hoping this is just a config problem, any help would be appreciated! Site is www.pezcollectors.com if you want to look.

Oct-28-2012 10:56:13 (1351439773)
getLineItemDetails 3
Tax Subtotal does not match sum of taxes for line-items. Tax details are being removed from line-item submission data.
0 0.05225Array
(
[AMT] => 5.2
[ITEMAMT] => 0
[TAXAMT] => 0.05
[SHIPPINGAMT] => 5.15
[SHIPDISCAMT] => 0
[HANDLINGAMT] => 0
[INSURANCEAMT] => 0
)

=================================

Oct-28-2012 10:56:13 (1351439773)
getLineItemDetails 4
Coupons/Discounts have affected tax calculations, so tax details are being removed from line-item submission data.
0 0.05
Array
(
[AMT] => 5.2
[ITEMAMT] => 0
[TAXAMT] => 0.05
[SHIPPINGAMT] => 5.15
[SHIPDISCAMT] => 0
[HANDLINGAMT] => 0
[INSURANCEAMT] => 0
)

AFTER:Array
(
[AMT] => 5.2
[ITEMAMT] => 0
[TAXAMT] => 0.05
[SHIPPINGAMT] => 5.15
[SHIPDISCAMT] => 0
[HANDLINGAMT] => 0
[INSURANCEAMT] => 0
)

=================================

Oct-28-2012 10:56:13 (1351439773)
getLineItemDetails 7 - subtotal comparisons
BEFORE line-item calcs: Array
(
[AMT] => 5.2
[ITEMAMT] => 0
[TAXAMT] => 0.05
[SHIPPINGAMT] => 5.15
[SHIPDISCAMT] => 0
[HANDLINGAMT] => 0
[INSURANCEAMT] => 0
)
- AFTER doing line-item calcs: Array
(
[AMT] => 5.2
[ITEMAMT] => 0
[TAXAMT] => 0.05
[SHIPPINGAMT] => 5.15
[SHIPDISCAMT] => 0
[HANDLINGAMT] => 0
[INSURANCEAMT] => 0
)

=================================

Oct-28-2012 10:56:13 (1351439773)
getLineItemDetails 8
checking subtotals...
Array
(
[calculated total] => 5.20
[AMT] => 5.20
[TAXAMT] => 0.05
[SHIPPINGAMT] => 5.15
)

-------------------
difference: 0 (abs+rounded: 0)
=================================

Oct-28-2012 10:56:13 (1351439773)
getLineItemDetails 10
subtotals balance - okay
=================================

Oct-28-2012 10:56:13 (1351439773)
before_process - DP-1
Beginning DP mode
=================================

Oct-28-2012 10:56:13 (1351439773)
before_process - DP-4
options: Array
(
[AMT] => 5.20
[TAXAMT] => 0.05
[SHIPPINGAMT] => 5.15
[STREET] => 3705 SW 9th St
[ZIP] => 64015
[CITY] => Blue Springs
[STATE] => MO
[EXPDATE] => 092013
[EMAIL] => [email protected]
[PHONENUM] =>
[BUTTONSOURCE] => ZenCart-DP_us
[CURRENCY] => USD
[IPADDRESS] => 99.169.56.34
[CARDISSUE] =>
[CUSTOM] => DP-8497-1351439773
[INVNUM] => 8497-1351439773-[PezCollectorsStore]
[COUNTRY] => US
[PAYMENTACTION] => Sale
[SHIPTONAME] => Todd Jordan
[SHIPTOSTREET] => 3705 SW 9th St
[SHIPTOCITY] => Blue Springs
[SHIPTOZIP] => 64015
[SHIPTOSTATE] => MO
[SHIPTOCOUNTRY] => US
)

Rest of data:
5.20 09 13 Todd Jordan Discover
=================================

Oct-28-2012 10:56:13 (1351439773)
before_process - DP-5
resultset:
Array
(
[TIMESTAMP] => 2012-10-28T15:56:13Z
[CORRELATIONID] => 6f39bfb45a000
[ACK] => Failure
[VERSION] => 60.0
[BUILD] => 3926908
[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
[AMT] => 5.20
[CURRENCYCODE] => USD
[CURL_ERRORS] =>
)

=================================

Oct-28-2012 10:56:13 (1351439773)
termEC-2
BEFORE: Token Data:
=================================

Oct-28-2012 10:56:13 (1351439773)
termEC-10
Redirecting to checkout_payment - Stack: checkout_payment
Message: 10413 <!-- --> Transaction refused because of an invalid argument. See additional error messages for details. - The totals of the cart item amounts do not match order amounts.
Session Data: Array
(
[securityToken] => ddcfff04f219dec7563fc9e254c54613
[customers_host_address] => OFFICE_IP_TO_HOST_ADDRESS
[cartID] => 26351
[cart] => shoppingCart Object
(
[contents] => Array
(
[1733] => Array
(
[qty] => 1
)

)

[total] => 1
[weight] => 0.12
[cartID] => 26351
[content_type] => physical
[free_shipping_item] => 0
[free_shipping_weight] => 0
[free_shipping_price] => 0
)

[navigation] => navigationHistory Object
(
[path] => Array
(
[0] => Array
(
[page] => product_info
[mode] => NONSSL
[get] => Array
(
[cPath] => 3_180
[products_id] => 4192
[action] => add_product
)

[post] => Array
(
)

)

[1] => Array
(
[page] => shopping_cart
[mode] => NONSSL
[get] =>
[post] => Array
(
)

)

[2] => Array
(
[page] => checkout_shipping
[mode] => SSL
[get] =>
[post] => Array
(
)

)

[3] => Array
(
[page] => checkout
[mode] => SSL
[get] => Array
(
[fecaction] => null
)

[post] => Array
(
)

)

[4] => Array
(
[page] => checkout_confirmation
[mode] => SSL
[get] => Array
(
[amp;fecaction] => process
)

[post] => Array
(
)

)

[5] => Array
(
[page] => checkout_process
[mode] => SSL
[get] =>
[post] => Array
(
)

)

)

[snapshot] => Array
(
)

)

[check_valid] => true
[language] => english
[languages_id] => 1
[languages_code] => en
[currency] => USD
[today_is] => 2012-10-28
[updateExpirations] => 1
[session_counter] => 1
[customers_ip_address] => 99.169.56.34
[new_products_id_in_cart] => 1733
[valid_to_checkout] => 1
[cart_errors] =>
[cart_country_id] => 223
[country_info] => Array
(
[countries_name] => United States
[countries_iso_code_2] => US
[countries_iso_code_3] => USA
)

[payment] => paypaldp
[total_weight] => 0.12
[total_count] => 1
[customer_id] => 8497
[customer_default_address_id] => 12327
[cart_address_id] => 12327
[sendto] => 12327
[customers_authorization] => 0
[customer_first_name] => Todd
[customer_last_name] => Jordan
[customer_country_id] => 223
[customer_zone_id] => 36
[billto] => 12327
[shipping] => Array
(
[id] => usps_FIRST CLASS
[title] => United States Postal Service (1 x 0.13lbs) (First-Class Mail (2 - 5 days))
[cost] => 5.15
)

[insurance] => 0
[comments] => test coupon
[messageToStack] => Array
(
[0] => Array
(
[class] => checkout_payment
[text] => 10413 <!-- --> Transaction refused because of an invalid argument. See additional error messages for details. - The totals of the cart item amounts do not match order amounts.
[type] => error
)

)

[cc_id] => 102
[paypal_ec_markflow] => 1
[payment_attempt] => 2
)

=================================