Hi @gearmobile,
You need a screen to link the host user and the custom user for the correct screen. You can watch this video made by Victor : https://www.youtube.com/watch?v=_FjSolSWukg And this Docs will help you too! : https://help.adalo.com/how-to/creating-multi-sided-apps
You can use Stripe : https://help.adalo.com/component-basics/marketplace-components/stripe
You need another collection to store the availability times for the tools.
Replied here for this in your first topic : Database structure question - #2 by dilon_perera
Thank you