Applying For Visa. If my Bf give me Invitation Letter does he need to pay money or use some agent?

Hi,
Im from Philippines. Currently I'm working here in Singapore. Next year I have plan to visit my Bf in China Dalain. He was Pure Chinese. The Embassy here in Singapore told me that I will ask my Bf to give me Invitation Letter (one of the requirements they needed for applying Visa ). I just want to ask if my Bf give me Invitation Letter does he need to pay money or use some agent. Please Help. Thank you