Query string (total)

Hello,
I'm working with the following query string:
action=add&receiverEmail=myemail@email.com.br&currency=BRL&itemId=0011&itemDescription={Product Name (Name):1.1}&itemQuantity=1&itemAmount={Total:4}&itemWeight=8000

but the generated URL is:
http://website.com/?action=add&receiverEmail=myemail@email.com.br&currency=BRL&itemId=0011&itemDescription=Product%20Name&itemQuantity=1&itemAmount&itemWeight=8000

Returns an empty value to the total. I need to return the value in the following structure: '25.00', my final URL would be something like:
http://website.com/?action=add&receiverEmail=myemail@email.com.br&currency=BRL&itemId=0011&itemDescription=Product%20Name&itemQuantity=1&itemAmount=25.00&itemWeight=8000

How can I do this?

Gravity Forms version: 1.6.7
WP version: 3.3.1

Thanks!

Hello Chris,
I created the form before updating the plugin (sorry) =/

Now I created another form. The field of total returns:

itemAmount=R%24+50%2C00

itemAmount={Total:3}

Required product value with the dot ('.'). But the decimal currency of my country is by comma.

I need the following:

itemAmount=50.00

Thanks!

The problem is that the total value depends on other items (options).

And you said the decimal currency for your country is a comma, but in the "I need the following" you show it with a decimal? Do you need a decimal or a comma there?

Need a decimal (eg: 25.00).

I need to inform the URL only "25.00" to the payment gateway. The currency of my country is informed in another parameter (currency=BRL).

This product is represented in the store for: R$ 25,00
(brazilian real)

Thanks and sorry for my bad english.