Transactions – How do I know who sent me Bitcoin?

I’m working on a service that allows me to receive Bitcoin from a specific address and manage the Bitcoin for that user.

I’m using the Coinbase API and I can’t find a simple way to find out who sent me BTC. Someone recently sent me some and there was no record of the transaction except for a downloadable transaction history. Still, it seems strange as it doesn’t say anything about the transaction or the sender.

I’ve searched all Coinbase APIs extensively and haven’t seen anything that looks promising. It looks like the Coinbase API mirrors the Blockchain API, so there doesn’t seem to be any additional information I can find there.

Should there be a way to get information about a transaction?