BAPI_ALM_NOTIF_GET_DETAIL as GW Service

Hi,

I would like to consume the BAPI_ALM_NOTIF_GET_DETAIL as gw service. When I try to import the BAPI I get stuck at the beginning because the tutorial I was reading handle much easier FMs. What are the steps to import this BAPI? how to handle the key (NUMBER).?

Thanks a lot, Vanessa