Need help with Loopback Integrations

We are exploring the option of "Loopback Integration" previously known as "Inbound Interface" which got decommissioned since 22B.

We have received a step by step guide from Oracle on the new approach but still unclear with few of the steps mentioned in the document.

Reaching out to community if someone has already explored and implemented this and can help answer our queries.

Appreciate your help.

Content (please ensure you mask any confidential information):

We need clarifications on below points, kindly help:

1) In Step 1b from below screenshot, how do we get this payroll flow task query(Mastered query)? Id possible pls share the query.