JustForFans review
JustForFans sells recurring subscriptions to individual creator profiles. For people who publish together, it provides a Consent Center for collecting and keeping documentation.
Stopping a subscription
The fan help page says switching off auto-renew stops the next charge and leaves access in place until the current billed period ends. That matters if you are following more than one creator because the setting is changed for each subscription.
Documenting a collaboration
The verification guide asks creators for photo ID. The current legal page says everyone featured must be an adult and must consent to publication on JustForFans. The Consent Center accepts virtual signatures and lets the uploader organize records around an individual release or a production. Fansly documents a secure link for someone who needs to verify their identity and sign without opening an account.

Anabel’s take
I'd keep track of each creator’s renewal date from the start. If I were publishing with someone else, I'd want our consent documentation tied to the production before any release went on sale.