Question is how to deal with customer that is not paying through proper website channel and goes on increasing his offer?

2018-10-01 16:45:56

Yesterday i got an offer from a client to give 1500 reviews and 50 post on his social account,The client offered me $250 but he was saying that i will pay you by paypal not through website pay channel.i said to him that i will start my job until you send payment through proper site channel now he goes on increases his offer.I'm now confused whether i accept it or not? There is also a risk involve in this as after job completion possibility that he will not pay so what should i do?