请教CIF 成交的付款问题

各位达人，我是重卡销的，最近遇到一个客户要求cif 成交，报价过去后说同意价格，但是要出bl copy 以后才肯始付款。客户是英国的，但是货物要直接运到加蓬，像这样的客户是不是骗子啊，如果我答应先发货到目的港，到时客户不付款怎么？ 这是我要求先付30%的定金后，客户的回复，求高人指点。 thanks for your response, any way my dear like i said this is the condition that our government ge to us to create a long term business relationship for the business ok i he done business like this with so many companies in the world i neer disapoint any one i said ok it my priority , pls reason with me i repeat your 100%tt is within 24 hours i said ok pls reason with me and let us do business with one mind as one family ok pls urgent response is needed