Your marketplace members can, on many occasions, discuss together. It's a good idea to check what's going on: you can then learn about your user behavior and offer help whenever it's needed.
View all the discussion threads related to a transaction
Discussions related to transactions are started from the Checkout button* on a listing page. They can be:
discussions related to a paid transaction
discussions related to a free transaction
To browse these conversations:
Log in to your marketplace and go to your Admin panel
Open the "Transactions & Reviews / Manage transactions" page from your Admin panel
Click "View details" for the transaction you want to read more
You can also view all the details and next steps about that transaction
*The "checkout button" is the button in level with the listing's image, you can choose the name yourself for it so it will be named different things on each marketplace, common names are "buy", "book", "request".
View all the discussion threads related to a free conversation
Discussions related to free conversations are started from the Contact button on a listing page or a user profile. They are never linked to any payment.
To browse these conversations:
Log in to your marketplace and go to your Admin panel
Open the "Transactions & Reviews / View conversations" from your Admin panel
Click "Read conversations" for the conversation you want to read more
Let your users know
It's a very good idea to remind your users (in your terms, for example) that marketplace administrators can view discussions related to transactions.