Step One: Enter your subdomain into Merge Link
For example, if you sign in at "example11.sage.hr", add acme to Merge Link.
Do not enter the full "example11.sage.hr".
Step Two: Find your API key
1.) Log in and click on your name on the top right corner, and select Settings in the drop-down menu.
2.) Click on Integrations in the left hand menu, and select API in the drop-down menu.
3.) Copy the API key.
Add your API Key to Merge Link.