Yes it's good Advice for Any online Purchase.
as Totem is using a Third Party for their Billing, That Third Party might add EXTRA's to the submission form.
So make sure you read the entire form, and double check any check boxes.
It's not uncommon for the on line billers to BUNDLE a Free 1 day or 3 day trial to another service that will automatically re-bill if you don't cancel it.
So always double check the form.