What is the PayPal “amount” format in WPS?

Question

What is the allowed format for PayPal's Website Payments Standard (WPS) forms in the "amount" field? Must the decimal point be ".", or is it currency-dependant? Must there always be exactly two decimal places, or can there also be three (for currencies that have such small nominations) or none (for currencies that have hyper-inflation)?

I know that this should be a question for PayPal's documentation/forums, but the first has a vast room for improvement (to say the least) and the second is as speedy as a sleeping snail. I have posted a question there, but I don't expect any replies sooner than about two weeks. Hopefully someone here will have an idea.

Answer 1

Looks like it's not currency dependent and the API is expecting at most two (2) decimal places with a period separator.

amount

[...] Limitations: Value must be a positive number. No currency symbol. Must have two decimal places, decimal separator must be a period (.), and the optional thousands separator must be a comma (,).

Website Payments Standard Button Manager API Overview