Stripe is a payments platform that works as both a processor and a payment facilitator. The facilitator part is what most direct-response sellers meet: you sign up as a submerchant under Stripe's master merchant account, so you can take cards without applying for a merchant account of your own first.
Who it fits
Stripe suits a seller whose product sits clearly inside its published rules: a plain catalog, modest claims, normal refund rates. For that seller the standard plan is hard to beat on cost, because it is pay-as-you-go with no setup or monthly fee, and card rates are set per country on Stripe's pricing page. Larger businesses can ask for a custom interchange-plus package.
Where it goes wrong
The risk review happens after signup. Stripe's restricted-business list prohibits pseudo-pharmaceuticals and nutraceuticals that are not safe or make harmful claims, and its Unacceptable Risk Policy says that when an account is actioned, payouts are typically paused for 120 days from the first notice email before a formal review of the remaining balance. For a seller running paid traffic with subscriptions on the books, that hold is the number to plan around.
What it does not do
Stripe processes payments. It does not build funnel pages, split-test a checkout under one URL, or spread sales across several merchant accounts, so paid-traffic teams pair it with a checkout or funnel platform. For the choice between Stripe and a dedicated account, read high-risk merchant account vs Stripe.