In Things Fall Apart who is Okoye?

Okoye is a man who is getting married at the very beginning of the book. He is gathering funds for his wedding so he seeks to ask Unoka back for the money he has lent him. He serves to highlight the indebtedness of Unoka, as well as Unoka's attitude towards his debt. Unoka told him that someone else gets paid their money before OKoye.