Write PHP Code to enable Gravity Forms to set subscription order date to 1st of next month

I need to create custom code for Gravity Forms to sell a subscription product that is sold every day of the month, but not effective until the 1st of the next month, as long as the subscription is received/charged by the 25th of the month. Subscriptions from the 26th on, are effective the first of the 2nd month. Example: subscriber signs up on any dates between 6/1 to 6/25, effective date needs to be 7/1 and card charged on the date the subscriber signs up for the first time, but charges their card on the 25th of every month after the 7/1 effective date (not on the monthly anniversary of their subscription date). Example: subscribe on 6/26, then effective date is 8/1 (Gravity Forms must create/record effective date in database) and card charged one-time fee and subscription amount on 6/26 to pre-pay for the 8/1 effective date, but not again until 8/25 for the 9/1 cycle, again on 9/25 for 10/1 cycle, etc. I need the Gravity Form to feed [login to view URL] and paypal to properly account for this specific structure. I received this note from Gravity Forms in response to my request, if it helps provide insight: This is not a built-in feature in Gravity Forms or any of our add-ons, but you could create your own custom function to customize the start date of your subscription before creating it using the following filter [login to view URL] you can find an example in that page [login to view URL] PHP code usually goes in your theme [login to view URL] file, check the following link for more details: [login to view URL] I don't want Freelancer to edit the [login to view URL] file of my theme; you can create a custom functions plugin, you can see a tutorial of how to do it here: [login to view URL] I want this built as a regular plugin per the article above (Option #2) so that I can activate or deactivate this plugin. I also saw a different Form (Caldera Forms) use this code to CHANGE FIRST PAYMENT DATE FOR [login to view URL] PAYMENT PLAN. Their example is to charge the card 1 week later, but I need it to charge based on certain if/then parameters. Ex. if Current Date is before the 26th of the month, then 1) charge one-time fee and 2) recurring fee now, 3) make effective date the 1st of the next month, and 4) charge all future recurring fees on the 25th of each subsequent month after the effective date......if current date is after the 25th of the month, then 1) charge one-time fee and 2) recurring fee now, 3) make effective date the 1st of the 2 month later (ex. if 6/26, effective date is 8/1), and 4) charge all future recurring fees on the 25th of each subsequent month after the effective date [login to view URL] I don't want to use Caldera Forms, but using the above as an example of the coding. This must work with [login to view URL] and Paypal. Please let me know if you require any clarification. Thank you!