How to integrate PayPal payment on a website with PHP?

Question

PHP

I want to integrate express payment for services on the site (JS - front, PHP - back).
I can't figure it out with PayPal. All instructions are outdated. The link https://developer.paypal.com/docs/classic/lifecycl... leads to an empty page - there are no samples, actually. https://developer.paypal.com/docs/integration/web/ too much information, but I can't find examples. Not PayPal friendly at all. Apparently, paypal used to need business clients and paypal thought about the convenience of the API, but now it’s the other way around - business clients should think.
With stripe https://stripe.com/checkout it's much easier - right on the start landing page embed html code (I haven't figured out how to confirm the payment on the server yet, but it's not difficult to understand).
UPD:
Habr search https://habrahabr.ru/search/?target_type=posts&ord... did not give any results - all tutorials are designed for having a login/password, not a ClientID/SecretKey.
UPD 2:
For example, here's a snag: I did find a tutorial page, but:
https://developer.paypal.com/docs/classic/paypal-p...
The first step is to log into your account. And I'm not from the US, I can't register...
I only have a ClientID and a SecretKey from an employer who is from the US. There is no connection with him now, but everything should be ready in a couple of hours :(
UPD 3:
Things are moving forward. I registered with fake US data - I had to use a personal security generator of something there.
UPD 4:
After registration, I received a button with a product ID ...
But https://paypal.github.io/JavaScriptButtons/ is what you need.
Still don't know how to handle the response from PayPal.

Answer 1

Check out the finished bikes https://packagist.org/search/?q=paypal