Gift Cards and Sale Taxes Issue

[Kreykoui]

Hi everyone,

In my region, a gift card is sold without taxes but its application must be made on the total of the invoice, taxes included. Here is an example.
A customer buys a gift card worth 20.00 on my shop. The detail of the purchase is 20.00 without taxes (and not taxes included).
When the person who received the gift card uses it during a purchase, Prestashop applies the amount of the gift card to the total items before taxes.

Items =      75.00
Card =     - 20.00
Subtotal = 50.00
Tax 10% =   5.00
Final =       55.00

While the calculation requested by the government is this:

Items =        75.00
Tax 10% =      7.50
Sub Total = 82.50
Card =      - 20.00
Final =         62.50

The gift card must therefore be considered as a method of payment and not a reduction or discount.

Even the "Specialized" modules do not seem to offer this way of calculating.

Could some kind soul help me solve my problem please?

Thank you !