r/CloudFlare: Free and paid in same account?

r/CloudFlare: Free and paid in same account?
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This article archives a conversation, which took place in a subreddit post (original source linked below) and to which I contributed a solution or answer (with the u/MasterofSynapse handle), in a Q&A format.

Original Reddit post: https://www.reddit.com/r/CloudFlare/comments/wprksd/free_and_paid_in_same_account/

Question

I have a bunch of domains I would like to move to Cloudflare’s free tier. If I then went to pay for just a few of them to have the pro level, is that possible within the same account?

Answer

The regular Cloudflare plans, not Zero Trust, are billed on a per-domain basis.