How do I set parameters to only two decimal places on marketplace?

Hi!
I am having trouble getting this working. It is giving me a PE104 error.
Please see below my correspondence with 2checkout:

Thank you for contacting 2Checkout.com. My apologies for any delay in response regarding this issue, and I will be happy to help.

The following query string was captured during a test sale from your site:

https://www.2checkout.com/checkout/purchase?sid=2122449&cart_order_id=65ee2c9747c9&x_receipt_link_url=http%3A%2F%2Fonestepatatime.co.za%2Fstore%2Fshopping-cart%2Fconfirmation%2F&skip_landing=1&fixed=Y&currency_code=USD&id_type=1&c_prod_1=2086%2C1&c_name_1=Test&c_description_1=http%3A%2F%2Fonestepatatime.co.za%2Fstore%2Fproducts%2Ftest%2F&c_price_1=1.00&c_tangible_1=N&total=0.87719298245614

The issue causing the PE104 error is the "total" parameter's value:

total=0.87719298245614

The value must only go to the hundredths place (2 decimal places) for our system to accept the charge. Once your cart passes in a correctly-formatted total, this will resolve the PE104 error.

Many thanks,
Heather