Media market financing on a mini-job basis?

Out of sheer euphoria at the red friday sale, I bought a laptop for 990 euro from Mediamarkt and used it as a payment method for market financing. However, I have only been working on a mini-job basis since this month (ie 450 euro). As far as I know I have no Schufa entries, then I get through the financing? Do I just have to take my Perso and EC card with me to pick up the market?

The classic installment loan will usually not get you with an income of only 450 euro.