In the case of physical stores, customers only have to initiate payment with their personal credit card - activated by their bank for this service - enter their PIN and follow the instructions on the terminal. If their card has the payment splitting service activated, they will be shown the instalment options and can decide on the spot whether or not they want to split payment and over how many months.
In the case of e-commerce, during the payment process, if their card has the Plazox service activated, they will be shown a simple screen where with a single click, they can decide whether they wish to split payment or not and over how many months.