That's what I thought. I am glad. By the way, Obrigado. Muito apreciado! (Thank you. Much appreciated!)If the organisation who provides you with a disability pension has no restrictions on what the money can be spent on then I am sure any vehicle dealer will gladly take your money.
With regards to if you can get finance based on this payment then it depends on various factors, such as whether you have enough for a deposit if required, whether your pension is sufficient to cover the finance costs and if living costs need to be considered in the calculations.