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Ecommerce Website with Webflow and Memberstack

Is it necessary to include Memberstack inbuilt payment integration for a membership site or Is it possible to use Memberstack just for letting people signing up and login in to members/users only area. In other words what I want is an Ecommerce Webflow Website with Memberstack for sign up and login capabilities and using Webflow for designing and other stuffs in CMS and for payment Stripe/PayPal (Without Memberstack inbuilt payment integration). Is it possible or I have to include memberstack inbuilt payment integration to use on my site.
If it’s not possible with Memberstack can u suggest me some more options??