Should I Pay Him N500,000 For A Job?

I graduated since 2012 and have been searching for job since then. Though I stopped the search and I am gathering money from a small laundry business I am running to see if I could raise enough money to register to be a bet agent and start a bet shop this new football season, together with MMM hustle. On thursday last week precisely, I ran into an old course mate of mine who is now a customs officer, he was even on his uniform. I was surprised and inquired how he got into Nigeria customs knowing how difficult it is getting in there. He gave me detailed gist about an Hausa man who happens to be a top customs officer, he met three years ago in his business center, helped him got the job. We exchanged contact and he promised to contact the man to see if he could assist me to get one of the replacement slots.

The issue now is that he introduced me to the man as promised and I got to contact the man and he gave me his official email account and instructed I send my CV and photocopies of my credentials to him via email, which I did. Today he called me to tell me, he has 4 slots for replacement scheduled for October, (that some officers who are due for retirement will be leaving by the end of september) that I should pay him N500,000 (five hundred thousand naira),N50,000 (fifty thousand Naira) down payment and N450,000 when I get my appointment letter and start work. I contacted my friend and he told me I shouldn't worry, that he will loan me the N50,000 to pay him, but I should hustle the remind balance to pay him immediately I land the job.

My friend has sent the N50,000 into my account today to my greatest surprise, but I don't know where to get the balance N450,000 b4 the end of september and I don't want to go back to my friend that just assisted me with N50,000. I need advice if it is advisable to take a loan for such venture and where can one get such loan. Pls your opinion please, because I am kind of confused here. I need a job badly.