Free is the network account. Bronze, Silver and Gold are the same membership levels whether you buy them in the shop or get them from Twitch, YouTube or another platform. Higher levels unlock more modules and quotas in Access Center.

Checkout runs on the Me5rine store in one click, with the same account. Loyalty points can pay the total or reduce it. You come back here when the payment is done. A platform button (Twitch, YouTube, …) appears on a plan card only when that account level is mapped for that channel.

Yes. Cancel from Account → Subscriptions. You keep the level until the current period ends, then a short grace (two days by default) before returning to Free.

Yearly is the same membership level billed once per year, usually cheaper than twelve monthly payments.

Those are creator account levels, not shop products. They unlock modules in Access Center after you apply. Request partnership from this page — there is no checkout.