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This is what the page looks like on the Demo application:
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The wholesaler should click the Initiate Linking button.
If the wholesaler is not currently logged in to their Google Drive account, then they will be presented with a login form
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After logging in, the wholesale will be presented with an authorization form.
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The wholesaler should click the Allow button. After doing so, they will be redirected to your site.
Authorization is complete. You will now be able to associate a Channel with this Destination and subsequently distribute data/assets to them.