Webhook for junction tables - useful for marketplace transactions

I saw this video from No-Code Ireland How To Build A Booking Portal with Softr.io | No-Code Tutorial - YouTube but wasn’t able to log onto his site to access the resources page and wasn’t able to get a hold of him.

Its a bit of custom code that allows users to create a webhook that passes the pages list details and related list blocks record ID’s as parameters. This is essential functionality for marketplaces where you need to create a junction table joining a seller to a buyer.

Was wondering if anyone was able to access this code or wrote something similar?

Benjamin Fortunato