can I use zoho subscrition for my business?

Hello

I developed a visitor management app and I need a subscription management tool which can comply to my process, namely (see below).

1. FOR NEW CUSTOMERS

they sign up on my website choosing their desired plan and add-ons. all subscription come with a 15 days free trial. what's your recommendation here? embed your page, use my sign up form and send the data to zoho subscription? other?
I do not want their payment details before the trial is over (similar to Zoho solutions) whcih probably means they will receive a notification and log into the customer portal to put in their payment data (card number and so on) if they want to use the app after the trial.
Does Zoho Subscription allow for a extention of the trial? If so, is it automatic or manual?
once the customer is created along with the plan, the specific data needs to be pushed to the app which will create the same user (actually an admin user) inside the app. this admin will create sub-users and so on directly in my app and this has nothing to do with zoho subscription.

2. FOR EXISTING CUSTOMERS

can they update account details (such as contact person, address etc) and payment details (different card etc.)?
can they upgrade / downgrade their subscription plan? if so, i need the data pushed to my app everytime there is a change in this area
is this area integrated with some sort of ticketing? I mean, if I use zoho desk or some other app like zoho sales IQ, will they see the tickets in the same customer portal?

I need to make some comments on my app:

it comes with 15 days trial period
it only allows 1 plan/customer so if the customer wants the basic plan for 3 locations and the premium plan for 2 locations, I need to have 2 separate accounts in zoho subscription
the app is the first from a suite we are currently developing and I want the entire account management in ZOHO Subscription (to be able to do the actions mentioned above). we want to use unified login and we may need some data from your zoho subscription app.

We are now trying to identify different elements in your API but could not find everything we are interested in. we decided to stop for the moment or at least until you answer this post because we may be working in vain.

Thanks

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