Stripe Payment Confirmation & Wordpress Customization

There are two tasks in this milestone :

1) I would like to have automatic email after payment validated on stripe:
- I create a payment link on stripe
- Add that link to a wordpress page
- Then when user pays, send automatic email

Set automatic emails after payment is validated
+ Show me what to do to set automatic emails on other links that I will create

2) The website is a wordpress. Child theme is installed
Some pluggins have been customized : Optin builder (theme plugin) + event manager
And a plugin has been built from scratch (OTP) which is linked to optin builder

Your task consists in analyzing code and propose a solution so that if I update theme or wordpress version, I don"t loose the customized code

With event manager it can be tricky .. if you can find a way to save code do it, if it's tricky, leave it.

Most important is optin builder + OTP customization work -> if I update theme or wp I don't loose code.

Deadline: 3 days
At the end dill a word document to explain the work done at the end

Task not done = Job not done = Milestone not completed.