Do you require more than a marriage certificate for a name change; if so how do you verify that their legal documents have been changed?

Hello,
We are considering opening accounts for government entities. Currently, we only open accounts for natural persons, non-profit organizations and sole proprietorship DBAs. Does anyone open accounts for government entities and would you be willing to share your procedures? Also, what compliance requirements and risk considerations should we be aware of? Thank you! 

We are looking at different avenues for contacting members/customers regarding transactional info on their account; not marketing.  We have some that are not responding to mailed letters or phone calls regarding their dormant accounts and we are considering emails.  We have read the CAN-SPAM reg and will not be marketing to them and will still include the option to "opt out".  We have staff that want to use facebook messenger, but I don't feel social media messaging is the way to go.  Do you use any social media messaging to contact your members?  Do you have a sample of your authorization that your customer/members sign?  We will be running this by legal, but wanted to see what others are doing as we update our policies and procedures.