Should I use a User access token or a System User access token when configuring the Facebook Messenger channel?

[Sam_Williams]

You must use either a User access token or a System User access token when connecting your Facebook Page to your Conversation API app. If your Facebook Page is part of your business portfolio in the Meta Business Manager, you must connect your Page using the System User access token option. If your Page is not part of a business portfolio, use the User access token option.

[#2]

Watch this demo video to get a feel for how to make the most of connected conversations using Conversation API and the easily accessible demo on the Sinch customer dashboard:

The video shows you how you can get stared with Sinch using one simple API to reach customers over multiple channels and deliver a mobile-first experience that's out of this world.

Useful Links:

• Conversation API Getting Started Guide - takes you through all the different steps of creating your first app with Conversation API.
• Sinch Developer Documentation - contains comprehensive documentation and tutorials, which show you how you can quickly create and configure your first Conversation API app. 
• Learn more about Sinch Conversation API.