I would like to help make WooCommerce into a basic POS system using a barcode scanner to scan products in and out of WooCommerce.

It would be able to add SKU as per barcode and add and remove inventory as well.

include barcodes on products without having to get through a plugin would be a great idea for businesses with small physical store and warehouses.

At this point you can only view the information of your product when entering the number of the barcode number.
You can't scan the barcode (by phone) and go straight to products information.
When you have an event with a lot people it would be a good option to scan the barcode and see if the client has paid instead of entering the barcode number into the form.

Currently the WooCommerce Order Barcodes plugin only allows you to update an order status to "Completed" after the barcode is scanned. Ideally I think you should add support to allow shop owners to choose which status they would like the order to be updated to, even if it's a custom status (such as ones added using the "WooCommerce Order Status Manager" plugin). This would allow the plugin to be used for a huge range of custom abilities, such as confirming an order has been run through 'Quality Control' before it is ready to despatch.

Add clear button to clear field on barcode scanning widget. So there is no need to backspace the field to scan new barcode/QR-code

When an order is already checked in the text "Customer already checked in" is displayed in the color of the theme. It should be in red because it's an error message. It's also helpful for the operatos who scans the bar-/QR-code to see the order is already checked in.

Currently there's no way to see who has checked in, unless rescanning the barcode which is not a viable method.

Under Products or Bookings it shows the status as Completed/Paid, it would be great if there was a status here to say Checked In. Or just any type of way to see a list of who has and hasn't checked in.

At this point you can only view the information of your product when entering the number of the barcode number.
You can't scan the barcode (by phone) and go straight to products information.
When you have an event with a lot people it would be a good option to scan the barcode and see if the client has paid instead of entering the barcode number into the form.

Barcodes are now generated at one of two points. On the order confirmation (thank you) page or when viewing order details in WP Admin. This this means that orders generated via API are sent without barcodes.

Create the meta keys for the barcode earlier so that the barcode can be displayed in the PDF plugin WooCommerce PDF Invoices & Packing Slips.

Generate barcode during invoice printing for custom field eg. Loyalty Card Number

Search any order by QR-Code number in backend in orders overwiew

when the customer make booking for doctor on for example(Monday at 3:00 PM) while this booking only for this time & if the customer go after that time he can't take the service.

And so the system supposed to limit this

And the WooCommerce Order Barcodes not inform that the time is expired

It supposed a message issued from WooCommerce Order Barcodes that this booking is expired

Also some services as tickets which to be used for only one time, while it actually not happen

Barcodes are now generated at one of two points. On the order confirmation (thank you) page or when viewing order details in WP Admin. This this means that orders generated via API are sent without barcodes.