You can make qtty field as a hidden field with value of 1

Here is the template/line where it is shown
https://github.com/abantecart/abantecart-src/blob/47badf1f852a3cb2c35b5c978b4eb165766b578a/public_html/storefront/view/default/template/pages/product/product.tpl#L174

Here where you can change to hidden:
https://github.com/abantecart/abantecart-src/blob/47badf1f852a3cb2c35b5c978b4eb165766b578a/public_html/storefront/view/default/template/pages/product/product.tpl#L174

If you do not use extension/hook for this change, it can be wiped after next upgrade. Keep this in mind.

More detailed please.
What do you need to be fixed?

Hello

You need to customize this template file & line:
https://github.com/abantecart/abantecart-src/blob/master/public_html/storefront/view/default/template/pages/content/contact.tpl#L28

Do you mind sharing your import file?

Lewis White, do you have any finding to share?

Merged duplicated topics

Gary,
What is your AbanteCart version?
Post exact curl error you get

Hello Milan_VC,

Welcome to AbanteCart forum.

What you describe is a correct behavior. Customer's active cart is stored in the session and specific to given session. Once the session is lost or customer is logged off, sessions is cleared.
With new login, last cart content will be loaded from the database.
To achieve you requirement, you will need to reload cart from database all the time.
This code is in the customer class
https://github.com/abantecart/abantecart-src/blob/master/public_html/core/lib/customer.php#L191

What version of PHP do you have? Any errors in the log. Like I said before, it works for me.