Add your ApplicantStack account's subdomain
Add the subdomain for your ApplicantStack account.
For example, if you sign in at "acme.applicantstack.com", add acme below.
Do not add the full "acme.applicantstack.com".
Find ApplicantStack API key
Log in to ApplicantStack as an admin for your organization
Click on Update Settings in the right-side panel
In the section API Settings near the bottom of the page, copy and add the API Access Token to Merge Link.