e.g.
If your site name is erp.example.com and social login key name is okta then use
https://erp.example.com/api/method/frappe.integrations.oauth2_logins.custom/okta
e.g.
If your site name is erp.example.com and social login key name is okta then use
https://erp.example.com/api/method/frappe.integrations.oauth2_logins.custom/okta