I.m using password grant flow how to integrate login through facebook to that grant

i.m using custom login and sign up page with resourec owner password grant flow.
now i want to add login through facebook to the custom login and sign up page which i designed please let me know any of docs related. any help is highly helpful for us.

Hey there!

Sorry for such huge delay in response! We’re doing our best in providing you with best developer support experience out there, but sometimes our bandwidth is not enough comparing to the number of incoming questions.

Wanted to reach out to know if you still require further assistance?