What shall I do?

Hi,
I am Seo cum Content Writer and recently have started working for Indian Clients.
Indian Clients are ready to give me work, but they say that they will pay after approving content.
I have worked with 4 Indian clients like this and nobody pays after approval?
Please tell me what shall I do, shall I ask payment in advance or work like this?
Please guide.It is adding me lot of resentment.

See original post by eric_wahlberg