Find your BambooHR subdomain
Add the subdomain for your BambooHR account to Merge Link.
For example, if you sign in at "acme.bamboohr.com", add acme.
Do not enter the full "acme.bamboohr.com".
Find your BambooHR API key
Log in and click on your name in the upper right-hand corner of any page to get to the user context menu. Click on the API Keys link in the dropdown menu.
Click Add New Key in the upper left corner.
Input a name, and then click Generate Key.
Copy the API key that appears, and add it to Merge Link.