Sir i need one UI 4 BETA VERSION on my phone but unable to register  where it should me to register  fo the same?? Hope my pblm get clear soon

hey! SAMSUNG i need help.i have forgotten my SAMSUNG PAY MINI pin and i have deleted by mistakely my fingerprint data in my j7 max which is connected to this and now i have forgoted my pinso what should i do????plz tell me how should i recover my pin...