Paramterized webbooks

I am trying to integrate zoho subscriptions with my web application. I have my own database of users which is going to hold information regarding its zoho subscription status to enable, or disable certain features of the website.

By my current understanding, this is what I would expect the process to be:

1. When a user clicks subscribe on my web application, it is re-directed to a zoho hosted payment page, and provides identifying information about which user subscribed (I would assume, as url parameters)

2. When a subscription is activated (or deactivated), zoho will notify my app (vai a web hook?) and send the same user identifying information back to my app (again, probably url paramters) so that I can mark that user as subscribed within my own database.

I have 3 problems with this:

1. I don't see see any way to pass identifying information about my user to the payment page

2. I don't see how to pass that identifying information back to my app via webhooks.

3. It looks like the webbooks do not allow "localhost" urls for local development/testing.

Can someone give me some direction on this?

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