BAPI integration is one of the integration methods under PowerExchange for SAP Netweaver. These are not two different components.
And to have BAPI integration in place you need PowerExchange for SAP Netweaver license.
I did not understand your last question , however you can check in the workflow manager > connection tab to see if there are any SAP connections configured there and are they being used in any of the sessions.
Please refer below guide for more details regarding this connector and its other integration methods:
Note 9.5 has reached end of life and out of support. Please use any of the newer version of Informatica PowerCenter to explore these options.
Thanks Rakshitha for the explanation