What is the scoring system in badminton?

there are two ways as of now, old scoring system (service point??) and new scoring system (rally point), which is just introduced last year and now it's approved by the IBF. Using the old scoring system, you get a point only if your side serves and wins the rally. You have two serving chance (first/second serve) except when the game begins. The new scoring system, you get a point regardless your side serves or not. And there is no second serve. You only serve once. You can google with "Laws of Badminton" and it will give you more details.