Credit Card payment plugin not working

This is a known issue in the current release of HikaShop which will be fixed with next release this week. In the mean time, you can look at that thread for the fix:
www.hikashop.com/en/support/forum/4-how-...s-manually.html#5172

Could you download the latest version from this website and update ?
If it still doesn't work, could you give a screenshot of the configuration of your credit card plugin and checkout page where it doesn't work ?

Yes. You can just install over the previous version.

You can go in the config under the tab display to turn off the "regsitration" option.

That should remove the username/password fields from the checkout registration page. The remaining fields are the email address ( to send the notifications ) and the address fields which can be customized via the menu Display->Custom fields.

If you really don't want the login/address screens, you can remove the login_address_ views from the checkout workflow option of the configuration. The drawback will be that you won't have any billing address nor email notifications sent to the users.

You're talking about the login part on the left right ? That part can be hidden by adding the CSS below in the config under the tab display in the CSS zone:
.hikashop_checkout_login_left_part{ display:none;}

Some users want to deactivate the registration of users during the checkout but still want existing registered users to be able to login which is why the left part isn't removed when you turn off registration.

I was talking about the right part of the screen: there, the username and password fields should be removed so that users won't be registered.

The CSS code I gave you above is not in the default CSS of HikaShop. Otherwise, you wouldn't see the login part by default. You need to ADD it in that file.

We don't know of such problem where the user needs to click twice on the next button. Normally, when the user clicks on next it goes to the next step. It only stays on the current step if he made a modification and that this modification needs to be displayed (payment method change, shipping method change). Could you give the URL of your website so that we can see the problem ?