Yes, many gateways like Stripe or Paddle support standalone subscriptions via API or embeddable widgets. You don’t need a full CMS. On PIQ, there are examples where people implemented lightweight monthly billing with just a backend and some frontend JavaScript. Helpful if you're trying to keep things lean and not overbuild for a small product.
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Recurring Payments Without a Full Platform
Can I offer recurring payments on a simple website without using a full e-commerce platform? Just want to accept monthly payments.