what is providerKey in aspnetuserlogins table?

how can I create ProviderKey from google auth or facebook auth or the other OAuth2 ?
I want to set login with google and facebook in my graphql(or restAPI) server. but I don't know what to do.
what is providerKey in aspnetuserlogins table?

how can I create ProviderKey from google auth or facebook auth or the other OAuth2 ?
I want to set login with google and facebook in my graphql(or restAPI) server. but I don't know what to do.