PayNow.gg automatically handles Steam OpenID authentication when users enter the checkout flow. To let users log in with Steam directly on your site before purchasing, you can add a Steam SSO button in the header that connects to PayNow's authentication endpoint and stores their Steam session. Here is how to update `membership.html` to include a Steam login button, display the logged-in user's Steam profile/SteamID, and dynamically attach their Steam ID to the PayNow.gg purchase links. ```html MEMBERSHIPS | NUKE EVENTS
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