Since the Adaptive Payments option cannot be setup for new integrations the best option would be PayPal For Marketplaces.
Here is the information on the two options within the program:
PayPal For Marketplaces Documentation
Our PayPal for Marketplaces solution has two integration paths to choose from based on how you run your business:
Connected path. A marketplace model in which each individual PayPal merchant assumes financial liability, rather than you, the partner. All merchants must have PayPal Business accounts.
Managed path. A marketplace model in which the partner assumes financial liability. Merchants aren't required to have PayPal Business accounts.
The Connected Path Option may be the best option for your Business Model since it connects the Buyers and Sellers, without the partner being liable financially.
Here is the basic Integration Steps:
https://developer.paypal.com/docs/marketplaces/connected/#connected-path-integration-steps
Here is the demo, if you would like to see how it works.
Thank you,
Jennifer
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