Drupal 7.x

I'm wondering if anyone can offer up some insight or direct me to a module or two that might assist me in doing this. I am looking to build a platform where I can create multiple "Organizations" that someone can pay a fee to. That is really the only feature that I am looking to get started with. It would work something like this:

User:

• The user finds the organization they want to make payment to.
• They enter their information and can track their monthly billing.

Org:

I am using Drupal 7.x. I am using the popular theme is porto.

https://i.stack.imgur.com/Kmhok.png

Porto comes with a Mega Slider component. And that is what I am using here. I am using the Mega Slider that comes with Porto.

https://i.stack.imgur.com/UqjD0.png

I have a D7 multisite instalation in Apache2.  I have various subdomain sites and all work although i dissable anyone with a2dissite command,

Links in sites-enabled and files in sites-avalaible like good. I think that Apache maps all sites without consider vhost configuration.

A example of one of .conf site is:

Have a Drupal 7 site that may have been compromised. When working in the admin I get 500 errors (ran an error log and it has tons of 'Premature end of Script headers: php56.cgi'). I also noticed some 'style elements' are altered in the pages when displayed.

With suspicion I also ran an access logs report and in it are a lot of paths using a similar path to what is shown below. Can someone shed light if the path string like below is generated by Drupal or could it have been injected?  They are all in mydomain.com/sites/default/files/css

I need to auto-assign sequential user ID numbers to users in a specific role. Specifically these will be sellers in a consignment store, and I’ll use the ID numbers to cross-reference with the merchandise they are selling, the payments due to them, etc. 

Can I use Drupal's internal UID for this? It wouldn’t be, strictly speaking, a 1,2,3, sequential list of numbers, but I guess that wouldn’t really matter. 

Can I use a Rules-based field to assign the number? 

Hi,

Today I tried to upgrade our website to drupal 7.66.  It was giving a 404 message so I decided to roll back and look at it another time.

I deleted the contents of PUBLIC_HTML and restored from a backup file by copying the files.

Now our homepage just shows 'Index of /' https://eerr.org.uk/

Any help would be much appreciated.

Mark