Integrate with Sub Delay to Prorate Initial Price

[femiyb]

The add-on currently does not prorate the initial price for membership levels.

Some users use the Subscription Delay to set a specific date for the membership start date and would like to prorate the initial price based on the date the user signs up.

We currently have a snippet that does this but could look into integrating this into the Proration add-on

Recreating this issue:

• Install both the PMPro Proration add-on and the PMPro Sub Delay add-on
• Set a membership with a monthly renewal date with the sub delay, for example Y1-M2-01
• When users check out here, they are still charged the full price instead of a prorated amount.

[MaryOJob]

In a similar issue, the add-on would not prorate on levels that are upgrading or downgrading which had a number of days set for the delay.

Moderators Only: #462665

Workaround gist: https://gist.github.com/femiyb/a26ea74bf297fa67c67d3952ed3c30fb

[dwanjuki]

Similar issue. Ticket #490028
I was able to replicate. Proration isn't applied as expected when subscription delay is set to a number of days.