Alb. suffix "-oj"

I am trying to put all the data about Latin loans in Albanian in a
database. Working on it, I observed that the Latin verbs have been
"albanised" suffixing the Latin verb with the suffix "-oj".

Some examples for loans from Latin into Albanian:

detegere > dëftoj
dirigere > dërgoj
desiderare > dëshiroj

Question:

which is the origin of this suffix "-oj"? Which is its function?

Alex