Variable naming pattern

[ace-han]

• In graphene backend => UnderScoreCase
• In any frontend => CamelCase

Take below for example

# for the time being,  should be data.get('refresh_token')
# refresh_token = data.get("refresh_token") or refresh_token
# this refresh_token_code comes from 
# saleor/graphql/account/mutations/authentication.py
class RefreshToken(BaseMutation):
     class Arguments:
         refresh_token = graphene.String(required=False, description="Refresh token.")
#  although in the frontend it's `refreshToken` graphene will transform to `refresh_token`

# saleor-dashboard/src/auth/hooks/useExternalAuthProvider.ts
const token = getTokens().refresh;
const input = JSON.stringify({
   refreshToken: token
});
return tokenRefresh({ variables: { input, pluginId: authPlugin } }).then(...)