Changing billing cycles using upgrade button with Paypal subscription

[Seiya]

We get dozens of requests every week to upgrade monthly accounts to our much cheaper annual billing cycle. 90% of customers have Paypal subscriptions. The way we've been doing is as follows:

 

1. Issue a prorated refund.

2. Cancel Paypal subscription.

3. Create new order with new billing cycle

4. Copy over module information to new product. Terminate old product.

5. Request customer to pay invoice for new order in client area.

 

 

These steps which take about 10 minutes result in the customer having a new Paypal subscription for the new billing cycle. However the process makes us all cry followed by puking.

 

However, if we use the WHMCS upgrade product button it calculates (days till next due date * future billing cycle day rate - days till next due date * current billing cycle day rate) which usually results in a credit to the customer which is discounted on the next due date. This would appear much easier than the process above however the invoice that it generates doesn't give the customer the option of setting up a Paypal subscription.

 

Has anyone figured out how to do this with less effort and customer frustration? Its important that customers end up with a new Paypal subscription, that is all. Any help would be immensely appreciated by our team.