A month back I received an email from a person named Jennifer Horton (obviously a fake name). She (probably a HE) asked for sponsored post on my website with a link to their website COUPONSJI. She bargained for the rate at 90% discount roughly. And, even after refusing kept sending requests. In the end I decided to let them publish the post at the measly rate with their link. When I asked for the payment, they said that I will get it ASAP. A week passed, payment wasn't received. I sent a reminder. She said I will receive it 'today'. Not received. Even after 20 days it wasn't received. Then, yesterday, she said that her manager wants a minor change in the article. She wanted me to add an author bio with another link to her website. I refused and I asked for payment to what I have already delivered. She said that she will pay extra for the link (and her extra was Rs 100). Obviously, I refused. Now, she says they will either pay me extra Rs 100 with earlier bargained amount only if I put another link in author bio, or she will not pay at all.
So advise you to beware of doing guest posts with JENNIFER HORTON or COUPONSJI. Those guys will not pay you.