Hello, about google drive, i dont know any addon for rtmedia that can do this, its complicated so i dont think they will add that soon.
About the membership, you can offer free membership ( no checkout ) or paid membership. For the discount, you could use http://www.paidmembershipspro.com/add-ons/code-gists/pmpro-require-a-code-to-register/ and offer a Discount Membership only avaible for those who have a code
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