Client Portal - ZOHO Invoice and ZOHO CRM

Client Portal - ZOHO Invoice and ZOHO CRM

I am running a training business with membership subscription.

I am using Zoho Invoice, Zoho Subscription and Zoho CRM.

I would like to allow my clients (individual) to view what training they had attended before, what invoice they have and when their subscription expired.

The Zoho Subscription Client Portal works perfectly with Zoho Invoice. However, Zoho CRM Client Portal does not integrate with the abovementioned two. Which mean client has to log in 2 different portals to view partial information.

Any solutions?