Hello,
I am sorry about the issue, I assure you that many of our users do not use our hosting space, and have no problems with the payment methods.
You did not provide any updates on the post about PayPal: from what I can see the URL used in Step 5 still does not match the URL actually reached when visiting the website, and both the www and non-www version can still be reached.
I would suggest first of all fixing these aspects, so that it is possible to investigate the situation of the payment methods without other errors influencing the behavior of the website:

1) Choose whether you would like the website to be reached as https://crystalporcelainwareshop.com/ or https://www.crystalporcelainwareshop.com/
2) Set this as the URL in Step 5 - Export, refresh the files with CTRL + Preview and export all files
3) Set up a redirect from the version of the URL you did not choose to the one you are actually using, so that all visitors are sent to the correct URL. If you cannot find this option among the configurations of your hosting panel, you should be able to check with your provider's support to set this up.

I remain available.

Our registrar is different from our host. Moving a domain name back and fro from registrar to registrar can be really costy. We can't do this move unless both DNS and registrar are located at the place. This is absolute not an issue anymore. When we enter crystalporcelainwareshop.com and click twice on the URL in the address bar, the URL automatically changes to https://www.crystalporcelainwareshop.com Bing changes it right away with AI to https://www.crystalporcelainwareshop.com which is always the final target. Search engines switch sites and choose the www url even when there is no redirection courtesy of AI. 

The PayPal Commerce Platform pay option is still a mess. We have put it back but the PayPal button still does not appear and  the Pay Now button sent to the buyer via the purchase confirmation email redirects to our website host.

Domani è un altro giorno.

(Translated by Google)

The website crystalporcelainwareshop.com can be accessed with or without www. My browser does not automatically redirect to the www.

My 2 test orders as a "test user" can be deleted.

The settings for the web address with or without www. can also be configured using the .htaccess file that WebSiteX5 has already uploaded to the web space.

Download the .htaccess file from the web space, add the redirect code, and upload it back to the web space.

In the Code below, the redirect code with the .htaccess file is to the web address with .www, and the "Website URL" should also be the same in WebSite X5.

.

----- Content of the .htaccess file -----

# WebSite X5 - Start Code [do not edit]

<IfModule mod_deflate.c>
SetOutputFilter DEFLATE
</IfModule>

# WebSite X5 - End Code

<IfModule mod_rewrite.c>

RewriteEngine On

RewriteCond %{HTTP_HOST} !^www.crystalporcelainwareshop.com$ [NC]
RewriteRule ^(.*)$ https://www.crystalporcelainwareshop.com/$1 [L,R=301]

</IfModule>

-----------------------------------------

Code from >> https://www.redim.de/blog/nicht-www-auf-www-umleiten (German Website)

Hello,
from what I can see, you are currently using https://awardspace.net/file-manager/www/crystalporcelainwareshop.com/crystal-porcelain-shop.html as the URL in Step 5, this is the one I suggested to be changed as https://www.crystalporcelainwareshop.com/

Unfortunately, as Daniel W also mentioned, the redirect is not working for me: I checked on multiple browsers and I am not sent to the www version if I visit the other one.

Hello,

Nothing worked. On top of that my project does not load anymore. Error loading project. Object reference not set to an instance of an object. The backup on the computer does not load either. Do you have a backup on your end of Crystal Porcelain Ware Shop?

For those about to rock. There seems to be a lot of users who came across the following issue: error loading project. Object reference not set to an instance of an object. Forget it. You can delay your project. It won't open anymore. We went to our FTP files and uploaded a copy that was not recognized by Website X5 using the folder button on the open a project page. Impossible to upload a backup using the Website X5 folder in our documents. Too much security kills security.

However, after checking all the crazy possibilities around, we landed back to that folder button on the open a project page and guess what: it is possible via this folder button to go all the way into your hard disk to find Website X5 stored in there. A copy of our project was kept in there. Once selected, the project uploaded right away to land on the open a project page.

Make sure that you duplicate your project on the open a project page via the duplicate button once your project is selected otherwise it can turn into a real nightmare when your project gets stucked by the error loading project message.

Hello,
unfortunately from what I can see the situation is still the same: there is no redirect and the URL is https://awardspace.net/file-manager/www/crystalporcelainwareshop.com/crystal-porcelain-shop.html
What have you changed, specifically?
What do you see in Step 5 - Export?

Hello,

Your .htaccess code seems to work as far as the www is concerned but not for the PayPal Commerce Platform button. The Stripe Pay Now button does not work either. On our end in step 5 we have:

https://awardspace.net/file-manager/www/crystalporcelainwareshop.com

Hello,
could you please switch the URL to the actual URL of the website, https://www.crystalporcelainwareshop.com/ ?

Hello,

Unfortunately, we are not the file manager of our website. Awardspace is. It's their path not ours.

Unfortunately I am not familiar with their specific configuration, but so far all hosting providers I have encountered when providing support allowed for the correct URL to be set, have you checked with them specifically about this?
This is causing a mismatch between the URL that is reached when visiting the website and the one actually set in the project, and usually safety issues occur when this happens.