Client portal - Social Log - in - Inclusion??

Client portal - Social Log - in - Inclusion??

As a zoho user, I may remember the password for log in. Where as the client - is not a regular user. But its very important for our customer to log in,
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The customer is requesing us to send all the invoices by PDF as email.? Really no point in getting the custom domain with https:... etc.  Its not mere logo inclusion in the log in page for the my clients. We have to ease the log-in procedure, who is going to pay.

If the request makes sense, please enable social log-in option for custom domain - client portal.

Awaiting for your response,

Regards,

Kali