Drupal 8.x

Running Drupal Version 8.9.18. Have set up subscription service in Paypal and want to link buttons to website. Have pasted the Paypal code into a content box and tried again with pasting into the link box but I just get a lot of code and not a button. 
I'm not a programmer so please be very basic in any replies. Also I need to link Paypal to Drupal via an API number but I am not sure where to find it. Can anyone help. Thanks in advance. 

Hi . as gooogle launched his new version of Google Analytics, I have a site with Drupal 8 who can´t migrate to GA4.

As soon as I installed a module of Google Tag, the site cant´finish the installation, also I tried to upload the directory manually and install the module on Drupal but the site collapse, I understand that it can just work with Google tag or paste the code of  GA4 on the header of the site, unfortunatelly I don´t know to much about Drupal and can´t find the header of my site, I modified core/modules/sytem/templates/html.html.twig but still not working.

Does anyone knows up to how many products a Drupal online store can handle?

100,000?

1 million?

2 million?

Does anyone has a general estimate on the number?

Or what has been the biggest Drupal eCommerce store you have seen? (with the most products to sell online)

Thanks,

Hi I need to migrate my site to Google Analytics 4, as my Drupal versions it´s 8, I cant, just install a module.

However there is a way in I can just paste some code on my header and it´s done, but I can´t find it.

I need to find the index or something where my header is, do you have any idea of where it could be?

Regards

Hello everybody,