How Integrate Zoho API without hosted pages and other payment method

Hi zoho team.

I want to integrate zoho api in my website, but without hosted pages, the reason is for what the register process of new users is diferent. We not solicit credit card or payment method on begin, only during or after free 30 days.

Zoho subscriptions we will use for manage clients, reminders, payments, on begining.

We have one table of plans with the plans especifications. What the best form to relate plans in we own db with zoho api plans and to guarantee replication.

The other hand, how can to integrate payment method payu of colombia?.

Thank you.