What is the difference is between the Pre-paid billing WHMCS module and the Post-paid billing WHMCS  module for SolusIO?

Question

What is the difference is between the Pre-paid billing WHMCS module and the Post-paid billing WHMCS  module for SolusIO?

Answer

WHMCS module solusiovps with prepaid billing model is developed by us. And WHMCS addon with post-paid billing method is developed by WHMCS.
The difference between the two billing method is:

• Prepaid billing
  

  Customers pay in advance for the services you provide. The payment is monthly, recurrent, and fixed. It doesn’t depend on the amount of actually consumed resources (within the selected offer).

  Customers receive the SolusIO services but they don’t have access to the SolusIO interface.

• Postpaid billing

  Customers pay only after the services were provided. Customers can pay per hour of actually consumed resources (hourly billing) or they can pay a fixed monthly price (monthly billing).

  Unlike prepaid billing, customers receive access to the part of the SolusIO interface called “user area”.

For more information please refer to these links:

https://docs.solus.io/en-US/latest/billing/solusio-billing-integration.1/ - about SolusIO billing integration in general. 
https://www.solus.io/solusio-and-whmcs-turnkey-solution-released/ - about Post-paid billing add-on
https://docs.solus.io/en-US/latest/billing/prepaid-billing.4/ - about Pre-paid WHMCS billing module