Microsoft Dynamics CRM integration with Biztalk /DB2

Hi Guys,

I have Dynamics CRM 2016 Online. I want to create plugin which will execute on the specific event of form.  This plugin will pass/transfer specific Key/values to Biztalk server. Biztalk will get values from DB2 Database server using  Key/values) and return values back to plugin/form.

Let me explain with an example.

I have contact form in Dynamics CRM online and Contact form has field named SSN#. When I type SSN#, I want to use Biztalk/DB2 to get the first name, Last Name and DOB from DB2 database using SSN# and these fields ( first name, Last Name and DOB) should be auto populated from DB2 database.

I need your valuable suggestions, what is the best way to achieve above functionality.

Thanks in Advance,

Alex