Which Zoho product to use?

I am rolling out a Saas based online service. I am planning to provide 3 different plans for customers

9.99$ a month

19.99$ a month

29.99$ a month

Apart from subscription cost, there are on demand services that customers can order and we need to expense them accordingly. We charge our customers on monthly basis (subscription + on demand expenses). I have the following requirements

1. Ability to manage subsrciptions for customers

2. Add an expense for customer based on on-demand orders

3. A portal for our customers, so they can login and view their monthly billing statements. This portal should support custom domain (customer.ourwebsite.com)

4. Customers should be able to drill down into each month and see the details on each expense.

5. Customers should be able to download any of the previous monthy billing statement as a PDF.

5. Monthly billing statement PDF must be e-mailed to customers

I am not clear on what products of Zoho should I use to achieve the above?

Thanks

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