Please share more details about your setup, and ideally include screenshots of your scenario so the community can better understand what you have built so far.
It may also help to review the platform’s API documentation to understand which endpoints are responsible for specific actions and capabilities:
Keep in mind that most of us rely on general knowledge - we don’t have access to every platform and may not know the specific logic behind each one.
However, for similar workflows, you will most likely need to either create a small mapping database or hardcode the FB Leadform IDs to specific job openings if this is a one-time project so leads can be assigned to specific offer.
Also I do not think that you need that many requests- this endpoint should cover your needs.