Lodged FIR after 2 month for minor accident

Hey, Around 2 months back i met with an accident (car) with a 2 wheeler (bike) in blind turn of street. Although I used horn of car before took turn but biker was driving to fast he did not slow his speed therefore, accident was met. a lady sit behind biker was injured. As my moral responsibility I rushed to inquired person to hospital for treatment.a lady rips was fractured. I paid (Rs. 7500/) all hospital bill as well as repaired his bike also . even through whole mistake was not mine . After 3 -4 days he is asking for he was started to seek 20k and saying pay amount otherwise he will lodge FIR . I thought he was just trying extract money from me. so I ignored. After 2 month today, I received call from Police station that FIR has been lodged again me . Now I am worry about how to deal? How i will be ensure that FIR actually has been lodged or it is just a way to extract money fro me ? Whether After 2 month he can FIR against me? he noted my car number and name Moreover, is there any exemption if L (learning) i mentioned in my car glass?