Which domain (supported by siri kit) does my app fall into and which intent to use to implement siri?

I am trying to implement siri in my app. It's a bank app we can make for instance "payments for electricity", sometimes to pay we need to write our "clientId" in the app. We want to use Siri to pay this.

For example "Pay my electricity service using 'app name'".

So i was wondering to which domain (the domains that support SiriKit) my application falls and which intent to use it.