I have a merchant account at Coinbase for Bitcoin. It is wonderful! Coinbase just added support for Litecoin but I see no option to allow users to pay in LTC from the Coinbase checkout, API or developer documentation. I can't even find any content relating to it when searching on Google. I'd also like to know the same thing with Ethereum.
Is it possible to use Coinbase for Litecoin and Ethereum payments or were these just added to Coinbase for exchange?