A way to describe pricing data
If you want to relay pricing data to the server, you instantiate ECPrice. For example, when you purchase a title via ec.purchaseTitle on ECommerceInterface, you're expected to present a price as a parameter.

ECPrice expects exactly two parameters for its single constructor: amount, and currency.
var price = new ECPrice(amount, currency);
For example, let's assume you wish to instantiate a price representing 4.99 USD. Both the amount and the currency are strings.
var price = new ECPrice('4.99', 'USD');

Property Name
The amount that this ECPrice object represents, as a string. It is not converted to a numerical type for usage.
The currency this ECPrice object represents, as a string. There is no defined list of currencies checked against, so any value may be utilized.
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