User Guide

Button Manager NVP API April 2012 55
HTML Variables for PayPal Payments Standard
HTML Variables for Individual Items
A
tax Optional Transaction-based tax override variable. Set this variable to a
flat tax amount to apply to the payment regardless of the
buyer’s location. This value overrides any tax settings set in
your account profile. Valid only for Buy Now and Add to
Cart buttons. Default – Profile tax settings, if any, apply.
tax_rate Optional Transaction-based tax override variable. Set this variable to a
percentage that applies to the amount multiplied by the
quantity selected during checkout. This value overrides any
tax settings set in your account profile. Allowable values are
numbers 0.001 through 100. Valid only for Buy Now and
Add to Cart buttons. Default – Profile tax settings, if any,
apply.
6
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quantity
Optional 1 – allows buyers to specify the quantity.
 Optional for Buy Now buttons
 Not used with other buttons
1
weight Optional Weight of items. If profile-based shipping rates are
configured with a basis of weight, the sum of weight values
is used to calculate the shipping charges for the payment.
Allowable values are decimals numbers, with 2 significant
digits to the right of the decimal point.
weight_unit Optional The unit of measure if weight is specified.
Allowable values are:
 lbs
 kgs
The default is lbs.
on0 Optional First option field name and label. The os0 variable contains
the corresponding value for this option field. For example, if
on0 is size, os0 could be large.
 Optional for Buy Now, Add to Cart, Subscribe,
Automatic Billing, and Installment Plan buttons
 Not used with Donate or Buy Gift Certificate buttons
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on1 Optional Second option field name and label. The os1 variable
contains the corresponding value for this option field. For
example, if on1 is color then os1 could be blue.
You can specify a maximum of 7 option field names (6 with
Subscribe buttons) by incrementing the option name index
(on0 through on6).
 Optional for Buy Now, Add to Cart, Subscribe,
Automatic Billing, and Installment Plan buttons
 Not used with Donate or Buy Gift Certificate buttons
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Name
Required
or
Optional Description
Character
Length