So we have this situation where we're really integrating into a platform where the user can choose between multiple services. It's an ecommerce platform and each client will have a different URL. For example, site1.platform.com will be separate from site2.platform.com. I looked at using OAuth 2.0 for it, but the Redirect_URI will need to be different for each so that won't work. What would you recommend for this? We have considered registering a new app for each site that uses Constant Contact (some will use different email services), but I wondered if there was a more "official" solution to this. Thanks.
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