Retrieve payment transactions information by api

Hi,

I would like to generate a receipt with information from certain transaction given by the api (by transaction ID maybe).
I know that the information I want is potentially stored in a batch, but in the api documentation it seems that the only endpoint serving me well would be BatchSummary which doesn't give me enough information.
I found this endpoint searching through https://{{URL}}/api/gatewaytransaction, but it doesn't seem to be related to a batch and I don't really understand what those transactions are, can you enlighten me please.

Thank you.
Eric