Unable to retrieve fee component of a payment.

As per #14, the 'new' Amazon Pay API apparently provides no way to retrieve the fee that was charged to process a given payment.

This information was available via previous Amazon Pay APIs, and is seemingly *still* available via those APIs, for payments made via the new API. Given that I've seen multiple suggestions/warnings not to make use of both APIs concurrently for charging customers, It seems extremely odd that the only way to retrieve the fee information currently, is to use both APIs/SDKs - one for creating and checking the charge, and then a different one to retrieve the fee.

I opened issue #14 about this previously, and it was summarily closed by someone who either didn't read what I'd written or didn't comprehend what I was asking about.

Begin with issue #14 and compare the new and previous Amazon Pay API/SDK fee-retrieval paths described here. Confirm whether the new API exposes a supported fee field or operation, and treat the work as complete only when the SDK provides or clearly documents a supported way to retrieve the fee for a payment.

Written by the indexing model from the issue text.