Confused About "Ad Hoc Amount" in Offer Letter: Who Pays the 3000 Rupees Monthly?

In the offer letter, I got confused about the statement "You will be paid an ad hoc amount of 3000 rupees per month." What is the meaning of that? Will I pay, or will the organization pay me?

Ad hoc is a word that originally comes from Latin and means “for this” or "for this situation." In current American English it is used to describe something that has been formed or used for a special and immediate purpose, without previous planning.
Ad hoc can be used as an adjective or an adverb. It is used more often as an adjective, especially in these expressions:
1 ad hoc committee
2 ad hoc group
3 ad hoc basis or on adhoc basis