How do I cancel my Topic subscription?

How do I cancel my subscription billed through Amazon Fire?

How do I cancel my subscription through Amazon Channels?

How do I cancel my subscription billed through Apple? (App Store or Apple TV Channels)?

How do I cancel my subscription through Google Play?

How do I cancel my subscription billed through Roku?

How do I cancel my subscription through Roku Premium Channel?

Can I get a refund?

Refund requests through iTunes, Apple TV, Roku, Google Play, or other 3rd party billing parties