Help when I try making in app purchases it says Unable to load"Try again later

When I try making a in app purchase it asks for my pass (as usual) then it says your security info needs to be checked something,like that.then I press ok then I'm in my purchase place ( the place where it asks for ur name address payment way) on the bottom it says Unable to load. Please try again later. I ignored it and pressed done when I pressed it it said if I want to make the purchase again.so I click yes then the same thing repeats PLS HELP I RLLY NEED THE IN APP PURCHASE PLS THX