Personal discount is a type of discount that is applied for individual customers
Personal discount can be edited both manually and via API.
Please note that it is not possible to enter a personal discount if you are using the 'Free' plan.
You must activate the ability of users to set personal discounts in the "Discounts" section under the "Personal discount" option.
In the user group settings] you can restrict access rights to edit this field. Personal customer discount is specified in the customer card in the "Finance" subsection.