Google Products

In your Google products account, you need to enter a feed name. That name will have to be the same in the plugin.

Here is the documentation page of Google, in order to setup your account on their end:
support.google.com/merchants/bin/answer.py?hl=en&answer=188475

That's not what you should do.

There is no xml file to create.
Just put a file name in google, like that: my_store.xml
In the plugin, just do the same: my_store.xml
and try again.

You should not create a scheduled upload.
Just close that popup. There, on that listing, under the "File" column you should have the name of your data feed.

It depends on the settings of the plugin where you can define that period in seconds.
Make sure that your cron is running correctly and that you configured the FTP settings in your google merchant settings and in the plugin and it should work.

For the plugin it's your google user account username and password which need to be entered in the plugin so that it is recognized by Google.

If you download the xml file manually and upload it yourself to google, does it work ? If no, then you should first check on that problem.
If yes, then the problem is either the login to google which is not correct OR the plugin which is not triggered by the cron. So make sure that your credentials are correct, that the plugin is published and also check the ordering of the plugin in the joomla plugins manager as we had someone having a problem with it when the ordering was at 0.
Also, if the plugin uploads the file but that there is a problem during the upload, you should have some information on the problem in the "last upload date" column in the data feeds listing of google merchant.

Let us know what you find.

Thank you for the access you provided. We'll look at that tomorrow as we won't have time to debug the problem today.

We'll also look at your other problem at the same time. If you could also provide a FTP access to your website it would help us find the problem.

I changed the frequency of the plugin to 1 so that it triggers each time the cron is run.
Then, I went to your cron URL that you can find in the configuration of HikaShop and I got the Errors:
JFTP::login: Unable to login
JFTP: :write: Unable to use passive mode

That means that your username/password in your plugin is not correct.

I try again your cron and I still have the same error.
Please follow google guidelines on that problem:
support.google.com/merchants/bin/answer.py?hl=en&answer=160568

The FTP credentials. But it's not the ones of your website FTP. It's the FTP credentials of your google merchant account.