CRM and Invoicing

CRM and Invoicing

First, let me explain that I am new to Zoho and follow that up with a basic questions..... Is the invoicing inside the CRM and the Zoho Invoicing two very different products? It seems that I can't find some basic functions in the CRM invoicing.

Can somebody please direct me to recurring invoices in the CRM?

Also, How can I establish Paypal Inside the CRM, as a payment option for my clients?