I will do stripe checkout PHP

I will integrate stripe checkout (one time payment) to your existing or new app.

Or change existing stripe code to stripe checkout.

Stripe checkout is secured and recommended way to use Stripe that has benefits over Stripe charge:

1. No need for extensive javascript - more pagespeed (if you use it on guest pages).
2. More payment methods available.
3. No need to design form and show it on your website - will gain more trust for users to enter credentials on the stripe website form.

I use the stripe recommended way, using webhook, to mark order as paid.