Add change to product price on google.

Hello,
I would like to ask if there is the feasibility of adapting the plugin for a common feature in electronic commerce in Brazil.

Mostly in Brazil, stores give discounts for payment in cash or pix (electronic bank transfer in Brazil), that is, the price composition generally works as follows:

Product A: BRL 1000

By selecting “cash or pix” payment option, Product A gets a 10% discount.

Product A in “cash or pix”: R$900 in the chackout after selecting the payment option.

In Brazil it is allowed and always displayed the value of the cheapest payment condition, ie I would like the price sent to the merchant center to be the value with the 10% discount given by the payment selection plugin.

The most correct way is for the feed or api to send all products with a 10% discount.

Previously we edited the plugin code that changed the feed information by adding 10% less in the xml value, how could we make this change here?