For Paypal Commerce Plugin I have setup Sandbox and can do transactions no problem.
But where do you see the transactions in Paypal when using the Sandbox like you would in your Buinsess Dashboard ?
What is the link ?
One option is lookign at notifications See https://developer.paypal.com/developer/notifications
Notifications only show the emails sent to the buyer and don't contain full transaction details, though they can be used as a confirmation of successful payments without visiting a sandbox account.
The other option is using Sandbox.
The link is https://www.sandbox.paypal.com, this sandbox test site mirrors the features on the PayPal production servers.
You can create an individual test account, or use the ones automatically created for a developer account (https://developer.paypal.com/dashboard/accounts).
You have to set up a sandbox in the plugin configuration and pay with the above test account during the checkout. Transactions will be shown on the sandbox test site (https://www.sandbox.paypal.com/activities/), just like for a Business account.