There are several ways to see your buyers' details within the plug&paid system.
Customers Page:
Select Customers in the left sidebar menu, then click on a customer row to access its info sheet, or the 3 dots menu on the right and select the "View Page" option.
In the customer's info sheet you will be able to see their sales, personal information, subscriptions and more.
Sale Specific Customer Information:
In your Invoices page click on a customer's name on an invoice row to access their info sheet. An alternative is clicking the 3 dots menu on the right and selecting the "View Page" option, then clicking on the customer's name.