Suggestions

He mentions that paper would be saved and our competition already uses it that way.

That the pre-sale allows the product to be set aside so that it is not sold by another user. It's not out of stock, it's secluded

Alert the seller when the visited customer has a debit (balance)

We want to be able to see the total number of products that users have sold from their mobile phones, so that they can see if they are going to meet their daily goal.

That orders that arrive after office closing time go out for delivery within 48 hours and allow time to prepare them in the warehouse.

Nowadays, users can create movements outside of working hours, such as collections, and administrators don't realize it. There was a reported case where the user went and made “payments” to customers on weekends and that money was stolen because they didn't detect it in time.

Control which products can be sold depending on the area to which the customer/seller belongs.

Nowadays, the customer's balance is not affected if you create an order on the web, and it's important

This would help not to sell more than what is in the company's inventory. Example: I have 50, I assign 40 to Juan and 10 to Miguel, so it doesn't matter if you sell the product or not, they will never sell more than 50. In case Miguel needs to sell 12, I simply modify Juan's 40 and “change” the user.

Update the data here when the delivery is made