Show a link in account details

This doesn't have to be the first or most prominent link, but it should be clearly visible. If you're unsure about including it on the account page, it's suitable to place on the billing settings.

Confirm intent to cancel

Sometimes, a user misclicks. So it's okay to ask if they're sure they want to make this choice, and not just automatically canceling their subscription.

But... while the user is there, you can attempt a last ditch effort to reel them back (it cannot be pressuring or manipulative).

If the product can only be access with a subscription, you can remind them of the product's value.

If the product can be access in a free version, you can remind them of that specific subscription's value.

Request a reason for canceling (optional)

It can be helpful to receive feedback on why a user is canceling. Too expensive? Competitor preferred? Just don't need it anymore?

It's an easy way to start identifying the key factors affecting churn.

Confirm subscription has been cancelled

Now that it's canceled, make sure you tell the user when their subscription is active until.