How To handle Postpaid Rate Plans Payments

Hey all,

I am new to Apigee,

I would like to know about How Postpaid Plans (Recurring Plans) Payments are done .

I am Integrating Our own Payment Gateway so

1. How to integrate a third party Payment Gateway For Postpaid Payments?

2. Any Webhooks or Notification Service is available to Trigger Payments for Postpaid (recurring) payments.

For example:

Plan Gold(Postpaid):

Monthly 20 USD

Recurring Monthly

IF customer "A" subscribed to JAN 1 he should be Charged 1 Feb and so on

SO the payments are done by a Thirdy party Payment gateway so how to set up this payment

gateway to postpaid plans payments.

How to handle Payment Failures?

3. do I need to handle it outside of Apigee and call Credit API