API to move data out of GS

I have a request from a customer to get data out of GainSight via API. The customer is working with a couple tools (segment, tray.io). 

Here are some specifics: [i]"We would like the Co-pilot outreach data + GainSight data on emails sent, opened, received, body, subject, clicks on CTAs, triggers/filters, sender name, sender email, (+timestamps), Account Name/id, CSM Name/Email, etc."

I can see that they will want to get data out of different subject areas including MDA and SFDC objects.