Need example for updating product list prices using CRM API

Need example for updating product list prices using CRM API

We have imported several thousand products into Zoho CRM, but the Products module only allows "unit price," which is our purchase price or cost.  There doesn't seem to be a "list price," or selling price on a product.  So we looked at the Price Books module, but that doesn't seem to allow importing prices either.  Then we tried the API, but we don't see how to get or update the actual prices.

Can anyone provide an example, or point us at any documentation for maintaining the prices?